diff --git a/test.ipynb b/test.ipynb
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--- /dev/null
+++ b/test.ipynb
@@ -0,0 +1,1007 @@
+{
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "source": [
+        "# Ensuring this repository's animations are correct\n",
+        "\n",
+        "This notebook uses pandas to compute the actions illustrated in the other pages.  The results here can be compared to the results of the animations to ensure that the animations are showing the correct results."
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "import pandas as pd"
+      ],
+      "outputs": [],
+      "execution_count": 1,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "## Pivot"
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df = pd.DataFrame( {\n",
+        "    'Name'  : [ 'Abe','Abe','Abe','Amy','Amy','Amy' ],\n",
+        "    'Day'   : [ 'Mon','Tue','Wed','Mon','Tue','Wed' ],\n",
+        "    'Sales' : [    39,   68,   10,   93,   85,    0 ]\n",
+        "} )\n",
+        "df"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 2,
+          "data": {
+            "text/plain": [
+              "  Name  Day  Sales\n",
+              "0  Abe  Mon     39\n",
+              "1  Abe  Tue     68\n",
+              "2  Abe  Wed     10\n",
+              "3  Amy  Mon     93\n",
+              "4  Amy  Tue     85\n",
+              "5  Amy  Wed      0"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th></th>\n",
+              "      <th>Name</th>\n",
+              "      <th>Day</th>\n",
+              "      <th>Sales</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Mon</td>\n",
+              "      <td>39</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Tue</td>\n",
+              "      <td>68</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Wed</td>\n",
+              "      <td>10</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Mon</td>\n",
+              "      <td>93</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Tue</td>\n",
+              "      <td>85</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>5</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Wed</td>\n",
+              "      <td>0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 2,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df.pivot( index=\"Name\", columns=\"Day\", values=\"Sales\" )"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 3,
+          "data": {
+            "text/plain": [
+              "Day   Mon  Tue  Wed\n",
+              "Name               \n",
+              "Abe    39   68   10\n",
+              "Amy    93   85    0"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th>Day</th>\n",
+              "      <th>Mon</th>\n",
+              "      <th>Tue</th>\n",
+              "      <th>Wed</th>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Name</th>\n",
+              "      <th></th>\n",
+              "      <th></th>\n",
+              "      <th></th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>Abe</th>\n",
+              "      <td>39</td>\n",
+              "      <td>68</td>\n",
+              "      <td>10</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Amy</th>\n",
+              "      <td>93</td>\n",
+              "      <td>85</td>\n",
+              "      <td>0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 3,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "## Pivot Table"
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df = pd.DataFrame( {\n",
+        "    'First'    : [   'Abe',   'Abe',  'Abe',   'Amy',  'Amy',   'Amy' ],\n",
+        "    'Last'     : [  'Axel',  'Axel', 'Axel',  'Arnt', 'Arnt',  'Arnt' ],\n",
+        "    'Customer' : [ 'X Co.','Y Inc.','X Co.','Y Inc.','X Co.','Y Inc.' ],\n",
+        "    'Sale'     : [      39,      68,     10,      93,     85,       0 ]\n",
+        "} )\n",
+        "df"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 12,
+          "data": {
+            "text/plain": [
+              "  First  Last Customer  Sale\n",
+              "0   Abe  Axel    X Co.    39\n",
+              "1   Abe  Axel   Y Inc.    68\n",
+              "2   Abe  Axel    X Co.    10\n",
+              "3   Amy  Arnt   Y Inc.    93\n",
+              "4   Amy  Arnt    X Co.    85\n",
+              "5   Amy  Arnt   Y Inc.     0"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th></th>\n",
+              "      <th>First</th>\n",
+              "      <th>Last</th>\n",
+              "      <th>Customer</th>\n",
+              "      <th>Sale</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Axel</td>\n",
+              "      <td>X Co.</td>\n",
+              "      <td>39</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Axel</td>\n",
+              "      <td>Y Inc.</td>\n",
+              "      <td>68</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Axel</td>\n",
+              "      <td>X Co.</td>\n",
+              "      <td>10</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Arnt</td>\n",
+              "      <td>Y Inc.</td>\n",
+              "      <td>93</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Arnt</td>\n",
+              "      <td>X Co.</td>\n",
+              "      <td>85</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>5</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Arnt</td>\n",
+              "      <td>Y Inc.</td>\n",
+              "      <td>0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 12,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df.pivot_table( index=[\"First\",\"Last\"], columns=[\"Customer\"], aggfunc=\"sum\" )"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 13,
+          "data": {
+            "text/plain": [
+              "            Sale       \n",
+              "Customer   X Co. Y Inc.\n",
+              "First Last             \n",
+              "Abe   Axel    49     68\n",
+              "Amy   Arnt    85     93"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead tr th {\n",
+              "        text-align: left;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead tr:last-of-type th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr>\n",
+              "      <th></th>\n",
+              "      <th></th>\n",
+              "      <th colspan=\"2\" halign=\"left\">Sale</th>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th></th>\n",
+              "      <th>Customer</th>\n",
+              "      <th>X Co.</th>\n",
+              "      <th>Y Inc.</th>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>First</th>\n",
+              "      <th>Last</th>\n",
+              "      <th></th>\n",
+              "      <th></th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>Abe</th>\n",
+              "      <th>Axel</th>\n",
+              "      <td>49</td>\n",
+              "      <td>68</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Amy</th>\n",
+              "      <th>Arnt</th>\n",
+              "      <td>85</td>\n",
+              "      <td>93</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 13,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "## Melt"
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df = pd.DataFrame( {\n",
+        "    'First' : [   'Abe',  'Amy',  'Art' ],\n",
+        "    'Last'  : [ 'Smith','Sully','Smart' ],\n",
+        "    'SAT'   : [     123,    234,    345 ],\n",
+        "    'ACT'   : [     456,    567,    678 ],\n",
+        "    'GPA'   : [     2.0,    3.0,    4.0 ]\n",
+        "} )\n",
+        "df"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 14,
+          "data": {
+            "text/plain": [
+              "  First   Last  SAT  ACT  GPA\n",
+              "0   Abe  Smith  123  456  2.0\n",
+              "1   Amy  Sully  234  567  3.0\n",
+              "2   Art  Smart  345  678  4.0"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th></th>\n",
+              "      <th>First</th>\n",
+              "      <th>Last</th>\n",
+              "      <th>SAT</th>\n",
+              "      <th>ACT</th>\n",
+              "      <th>GPA</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Smith</td>\n",
+              "      <td>123</td>\n",
+              "      <td>456</td>\n",
+              "      <td>2.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Sully</td>\n",
+              "      <td>234</td>\n",
+              "      <td>567</td>\n",
+              "      <td>3.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>Art</td>\n",
+              "      <td>Smart</td>\n",
+              "      <td>345</td>\n",
+              "      <td>678</td>\n",
+              "      <td>4.0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 14,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df.melt( id_vars=[\"First\",\"Last\"], value_vars=[\"SAT\",\"ACT\",\"GPA\"] )"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 15,
+          "data": {
+            "text/plain": [
+              "  First   Last variable  value\n",
+              "0   Abe  Smith      SAT  123.0\n",
+              "1   Amy  Sully      SAT  234.0\n",
+              "2   Art  Smart      SAT  345.0\n",
+              "3   Abe  Smith      ACT  456.0\n",
+              "4   Amy  Sully      ACT  567.0\n",
+              "5   Art  Smart      ACT  678.0\n",
+              "6   Abe  Smith      GPA    2.0\n",
+              "7   Amy  Sully      GPA    3.0\n",
+              "8   Art  Smart      GPA    4.0"
+            ],
+            "text/html": [
+              "<div>\n",
+              "<style scoped>\n",
+              "    .dataframe tbody tr th:only-of-type {\n",
+              "        vertical-align: middle;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe tbody tr th {\n",
+              "        vertical-align: top;\n",
+              "    }\n",
+              "\n",
+              "    .dataframe thead th {\n",
+              "        text-align: right;\n",
+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th></th>\n",
+              "      <th>First</th>\n",
+              "      <th>Last</th>\n",
+              "      <th>variable</th>\n",
+              "      <th>value</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Smith</td>\n",
+              "      <td>SAT</td>\n",
+              "      <td>123.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Sully</td>\n",
+              "      <td>SAT</td>\n",
+              "      <td>234.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>Art</td>\n",
+              "      <td>Smart</td>\n",
+              "      <td>SAT</td>\n",
+              "      <td>345.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Smith</td>\n",
+              "      <td>ACT</td>\n",
+              "      <td>456.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Sully</td>\n",
+              "      <td>ACT</td>\n",
+              "      <td>567.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>5</th>\n",
+              "      <td>Art</td>\n",
+              "      <td>Smart</td>\n",
+              "      <td>ACT</td>\n",
+              "      <td>678.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>6</th>\n",
+              "      <td>Abe</td>\n",
+              "      <td>Smith</td>\n",
+              "      <td>GPA</td>\n",
+              "      <td>2.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>7</th>\n",
+              "      <td>Amy</td>\n",
+              "      <td>Sully</td>\n",
+              "      <td>GPA</td>\n",
+              "      <td>3.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>8</th>\n",
+              "      <td>Art</td>\n",
+              "      <td>Smart</td>\n",
+              "      <td>GPA</td>\n",
+              "      <td>4.0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 15,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "## Unstack/stack (level 0)"
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df = pd.DataFrame( {\n",
+        "    'Month' : [ 'Jan','Jan','Jan','Jan','Feb','Feb','Feb','Feb' ],\n",
+        "    'Week'  : [     1,    2,    3,    4,    1,    2,    3,    4 ],\n",
+        "    'Temp'  : [    31,   29,   26,   27,   25,   19,   22,   25 ],\n",
+        "    'Humid' : [    15,   20,    5,   14,    9,   14,   20,   19 ]\n",
+        "} )\n",
+        "df['Month'] = df['Month'].astype( 'category' )\n",
+        "df['Month'] = df['Month'].cat.set_categories( ['Jan','Feb'], ordered=True )\n",
+        "df = df.set_index( [ 'Month', 'Week' ] )\n",
+        "df"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 23,
+          "data": {
+            "text/plain": [
+              "            Temp  Humid\n",
+              "Month Week             \n",
+              "Jan   1       31     15\n",
+              "      2       29     20\n",
+              "      3       26      5\n",
+              "      4       27     14\n",
+              "Feb   1       25      9\n",
+              "      2       19     14\n",
+              "      3       22     20\n",
+              "      4       25     19"
+            ],
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+              "</style>\n",
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+              "  <thead>\n",
+              "    <tr style=\"text-align: right;\">\n",
+              "      <th></th>\n",
+              "      <th></th>\n",
+              "      <th>Temp</th>\n",
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+              "    </tr>\n",
+              "    <tr>\n",
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+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th rowspan=\"4\" valign=\"top\">Jan</th>\n",
+              "      <th>1</th>\n",
+              "      <td>31</td>\n",
+              "      <td>15</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
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+              "      <td>20</td>\n",
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+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>26</td>\n",
+              "      <td>5</td>\n",
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+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>27</td>\n",
+              "      <td>14</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th rowspan=\"4\" valign=\"top\">Feb</th>\n",
+              "      <th>1</th>\n",
+              "      <td>25</td>\n",
+              "      <td>9</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
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+              "      <td>14</td>\n",
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+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>22</td>\n",
+              "      <td>20</td>\n",
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+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>25</td>\n",
+              "      <td>19</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 23,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df.unstack( level=0 )"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 24,
+          "data": {
+            "text/plain": [
+              "      Temp     Humid    \n",
+              "Month  Jan Feb   Jan Feb\n",
+              "Week                    \n",
+              "1       31  25    15   9\n",
+              "2       29  19    20  14\n",
+              "3       26  22     5  20\n",
+              "4       27  25    14  19"
+            ],
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+              "    }\n",
+              "\n",
+              "    .dataframe thead tr:last-of-type th {\n",
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+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr>\n",
+              "      <th></th>\n",
+              "      <th colspan=\"2\" halign=\"left\">Temp</th>\n",
+              "      <th colspan=\"2\" halign=\"left\">Humid</th>\n",
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+              "    <tr>\n",
+              "      <th>Month</th>\n",
+              "      <th>Jan</th>\n",
+              "      <th>Feb</th>\n",
+              "      <th>Jan</th>\n",
+              "      <th>Feb</th>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Week</th>\n",
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+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>26</td>\n",
+              "      <td>22</td>\n",
+              "      <td>5</td>\n",
+              "      <td>20</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>27</td>\n",
+              "      <td>25</td>\n",
+              "      <td>14</td>\n",
+              "      <td>19</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 24,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "## Unstack/stack (level 1)"
+      ],
+      "metadata": {}
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "df.unstack( level=1 )"
+      ],
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "execution_count": 25,
+          "data": {
+            "text/plain": [
+              "      Temp             Humid            \n",
+              "Week     1   2   3   4     1   2   3   4\n",
+              "Month                                   \n",
+              "Jan     31  29  26  27    15  20   5  14\n",
+              "Feb     25  19  22  25     9  14  20  19"
+            ],
+            "text/html": [
+              "<div>\n",
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+              "\n",
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+              "    }\n",
+              "</style>\n",
+              "<table border=\"1\" class=\"dataframe\">\n",
+              "  <thead>\n",
+              "    <tr>\n",
+              "      <th></th>\n",
+              "      <th colspan=\"4\" halign=\"left\">Temp</th>\n",
+              "      <th colspan=\"4\" halign=\"left\">Humid</th>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Week</th>\n",
+              "      <th>1</th>\n",
+              "      <th>2</th>\n",
+              "      <th>3</th>\n",
+              "      <th>4</th>\n",
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+              "      <th>2</th>\n",
+              "      <th>3</th>\n",
+              "      <th>4</th>\n",
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+              "    <tr>\n",
+              "      <th>Month</th>\n",
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+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>Jan</th>\n",
+              "      <td>31</td>\n",
+              "      <td>29</td>\n",
+              "      <td>26</td>\n",
+              "      <td>27</td>\n",
+              "      <td>15</td>\n",
+              "      <td>20</td>\n",
+              "      <td>5</td>\n",
+              "      <td>14</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>Feb</th>\n",
+              "      <td>25</td>\n",
+              "      <td>19</td>\n",
+              "      <td>22</td>\n",
+              "      <td>25</td>\n",
+              "      <td>9</td>\n",
+              "      <td>14</td>\n",
+              "      <td>20</td>\n",
+              "      <td>19</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ]
+          },
+          "metadata": {}
+        }
+      ],
+      "execution_count": 25,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    },
+    {
+      "cell_type": "code",
+      "source": [],
+      "outputs": [],
+      "execution_count": null,
+      "metadata": {
+        "collapsed": false,
+        "outputHidden": false,
+        "inputHidden": false
+      }
+    }
+  ],
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+  "nbformat_minor": 0
+}
\ No newline at end of file