updating day13 notebook

DeepLearningSky · Aug 12, 2018 · 22b5c14 · 22b5c14
1 parent 2ba73aa
commit 22b5c14
Showing 1 changed file with 94 additions and 0 deletions.
diff --git a/day13/Missing Values (Basics).ipynb b/day13/Missing Values (Basics).ipynb
@@ -678,6 +678,100 @@
    "source": [
     "df[df[3] == 'UNK']"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Imputing by back filling "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0     0\n",
+       "1     0\n",
+       "2     0\n",
+       "3     0\n",
+       "4     6\n",
+       "5     9\n",
+       "6     9\n",
+       "7     0\n",
+       "8     0\n",
+       "9     0\n",
+       "10    0\n",
+       "11    0\n",
+       "12    0\n",
+       "13    0\n",
+       "14    0\n",
+       "15    0\n",
+       "dtype: int64"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# we can specify a back-fill to propagate the next values backward\n",
+    "df[13].fillna(method='bfill', inplace=True)\n",
+    "df.isnull().sum()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Imputing by forward filling "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "0     0\n",
+       "1     0\n",
+       "2     0\n",
+       "3     0\n",
+       "4     0\n",
+       "5     9\n",
+       "6     9\n",
+       "7     0\n",
+       "8     0\n",
+       "9     0\n",
+       "10    0\n",
+       "11    0\n",
+       "12    0\n",
+       "13    0\n",
+       "14    0\n",
+       "15    0\n",
+       "dtype: int64"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# We can specify a forward-fill to propagate the previous value forward\n",
+    "df[4].fillna(method='ffill', inplace=True)\n",
+    "df.isnull().sum()"
+   ]
   }
  ],
  "metadata": {