diff --git a/pandas/pandas.ipynb b/pandas/pandas.ipynb
index 6c8c4fd..f8f9780 100644
--- a/pandas/pandas.ipynb
+++ b/pandas/pandas.ipynb
@@ -4826,6 +4826,306 @@
       }
      ],
      "prompt_number": 94
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "DataFrames can rank over rows or columns."
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "df_13 = DataFrame({'foo' : [7, -5, 7, 4, 2, 0, 4, 7],\n",
+      "                   'bar' : [-5, 4, 2, 0, 4, 7, 7, 8],\n",
+      "                   'baz' : [-1, 2, 3, 0, 5, 9, 9, 5]})\n",
+      "df_13"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "html": [
+        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
+        "<table border=\"1\" class=\"dataframe\">\n",
+        "  <thead>\n",
+        "    <tr style=\"text-align: right;\">\n",
+        "      <th></th>\n",
+        "      <th>bar</th>\n",
+        "      <th>baz</th>\n",
+        "      <th>foo</th>\n",
+        "    </tr>\n",
+        "  </thead>\n",
+        "  <tbody>\n",
+        "    <tr>\n",
+        "      <th>0</th>\n",
+        "      <td>-5</td>\n",
+        "      <td>-1</td>\n",
+        "      <td> 7</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>1</th>\n",
+        "      <td> 4</td>\n",
+        "      <td> 2</td>\n",
+        "      <td>-5</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>2</th>\n",
+        "      <td> 2</td>\n",
+        "      <td> 3</td>\n",
+        "      <td> 7</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>3</th>\n",
+        "      <td> 0</td>\n",
+        "      <td> 0</td>\n",
+        "      <td> 4</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>4</th>\n",
+        "      <td> 4</td>\n",
+        "      <td> 5</td>\n",
+        "      <td> 2</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>5</th>\n",
+        "      <td> 7</td>\n",
+        "      <td> 9</td>\n",
+        "      <td> 0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>6</th>\n",
+        "      <td> 7</td>\n",
+        "      <td> 9</td>\n",
+        "      <td> 4</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>7</th>\n",
+        "      <td> 8</td>\n",
+        "      <td> 5</td>\n",
+        "      <td> 7</td>\n",
+        "    </tr>\n",
+        "  </tbody>\n",
+        "</table>\n",
+        "</div>"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 95,
+       "text": [
+        "   bar  baz  foo\n",
+        "0   -5   -1    7\n",
+        "1    4    2   -5\n",
+        "2    2    3    7\n",
+        "3    0    0    4\n",
+        "4    4    5    2\n",
+        "5    7    9    0\n",
+        "6    7    9    4\n",
+        "7    8    5    7"
+       ]
+      }
+     ],
+     "prompt_number": 95
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Rank a DataFrame over rows:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "df_13.rank()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "html": [
+        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
+        "<table border=\"1\" class=\"dataframe\">\n",
+        "  <thead>\n",
+        "    <tr style=\"text-align: right;\">\n",
+        "      <th></th>\n",
+        "      <th>bar</th>\n",
+        "      <th>baz</th>\n",
+        "      <th>foo</th>\n",
+        "    </tr>\n",
+        "  </thead>\n",
+        "  <tbody>\n",
+        "    <tr>\n",
+        "      <th>0</th>\n",
+        "      <td> 1.0</td>\n",
+        "      <td> 1.0</td>\n",
+        "      <td> 7.0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>1</th>\n",
+        "      <td> 4.5</td>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 1.0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>2</th>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 4.0</td>\n",
+        "      <td> 7.0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>3</th>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 4.5</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>4</th>\n",
+        "      <td> 4.5</td>\n",
+        "      <td> 5.5</td>\n",
+        "      <td> 3.0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>5</th>\n",
+        "      <td> 6.5</td>\n",
+        "      <td> 7.5</td>\n",
+        "      <td> 2.0</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>6</th>\n",
+        "      <td> 6.5</td>\n",
+        "      <td> 7.5</td>\n",
+        "      <td> 4.5</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>7</th>\n",
+        "      <td> 8.0</td>\n",
+        "      <td> 5.5</td>\n",
+        "      <td> 7.0</td>\n",
+        "    </tr>\n",
+        "  </tbody>\n",
+        "</table>\n",
+        "</div>"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 96,
+       "text": [
+        "   bar  baz  foo\n",
+        "0  1.0  1.0  7.0\n",
+        "1  4.5  3.0  1.0\n",
+        "2  3.0  4.0  7.0\n",
+        "3  2.0  2.0  4.5\n",
+        "4  4.5  5.5  3.0\n",
+        "5  6.5  7.5  2.0\n",
+        "6  6.5  7.5  4.5\n",
+        "7  8.0  5.5  7.0"
+       ]
+      }
+     ],
+     "prompt_number": 96
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Rank a DataFrame over columns:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "df_13.rank(axis=1)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "html": [
+        "<div style=\"max-height:1000px;max-width:1500px;overflow:auto;\">\n",
+        "<table border=\"1\" class=\"dataframe\">\n",
+        "  <thead>\n",
+        "    <tr style=\"text-align: right;\">\n",
+        "      <th></th>\n",
+        "      <th>bar</th>\n",
+        "      <th>baz</th>\n",
+        "      <th>foo</th>\n",
+        "    </tr>\n",
+        "  </thead>\n",
+        "  <tbody>\n",
+        "    <tr>\n",
+        "      <th>0</th>\n",
+        "      <td> 1.0</td>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 3</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>1</th>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 1</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>2</th>\n",
+        "      <td> 1.0</td>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 3</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>3</th>\n",
+        "      <td> 1.5</td>\n",
+        "      <td> 1.5</td>\n",
+        "      <td> 3</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>4</th>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 1</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>5</th>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 1</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>6</th>\n",
+        "      <td> 2.0</td>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 1</td>\n",
+        "    </tr>\n",
+        "    <tr>\n",
+        "      <th>7</th>\n",
+        "      <td> 3.0</td>\n",
+        "      <td> 1.0</td>\n",
+        "      <td> 2</td>\n",
+        "    </tr>\n",
+        "  </tbody>\n",
+        "</table>\n",
+        "</div>"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 97,
+       "text": [
+        "   bar  baz  foo\n",
+        "0  1.0  2.0    3\n",
+        "1  3.0  2.0    1\n",
+        "2  1.0  2.0    3\n",
+        "3  1.5  1.5    3\n",
+        "4  2.0  3.0    1\n",
+        "5  2.0  3.0    1\n",
+        "6  2.0  3.0    1\n",
+        "7  3.0  1.0    2"
+       ]
+      }
+     ],
+     "prompt_number": 97
     }
    ],
    "metadata": {}