diff --git a/pandas/pandas_clean.ipynb b/pandas/pandas_clean.ipynb
index 8523bc3..42b5484 100644
--- a/pandas/pandas_clean.ipynb
+++ b/pandas/pandas_clean.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:f776a525b9cd73f2f19e9e51e3318238aa9c122bb94228ae307286d483a6c2f1"
+  "signature": "sha256:1c8b7cab9b55eb5888612d0b5149649565c258456e73e61b039225439aa11502"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -261,7 +261,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "df_1.replace({'state' : { 'MD' : 'MARYLAND' }})\n",
+      "df_1.replace({'state' : { 'MD' : 'MARYLAND' }}, inplace=True)\n",
       "df_1"
      ],
      "language": "python",
@@ -301,13 +301,13 @@
         "    <tr>\n",
         "      <th>3</th>\n",
         "      <td> 4.0</td>\n",
-        "      <td>       MD</td>\n",
+        "      <td> MARYLAND</td>\n",
         "      <td> 2014</td>\n",
         "    </tr>\n",
         "    <tr>\n",
         "      <th>4</th>\n",
         "      <td> 4.1</td>\n",
-        "      <td>       MD</td>\n",
+        "      <td> MARYLAND</td>\n",
         "      <td> 2015</td>\n",
         "    </tr>\n",
         "  </tbody>\n",
@@ -322,8 +322,8 @@
         "0  5.0  VIRGINIA  2012\n",
         "1  5.1  VIRGINIA  2013\n",
         "2  5.2  VIRGINIA  2014\n",
-        "3  4.0        MD  2014\n",
-        "4  4.1        MD  2015"
+        "3  4.0  MARYLAND  2014\n",
+        "4  4.1  MARYLAND  2015"
        ]
       }
      ],
@@ -455,13 +455,13 @@
         "    <tr>\n",
         "      <th>3</th>\n",
         "      <td> 4.0</td>\n",
-        "      <td>       MD</td>\n",
+        "      <td> MARYLAND</td>\n",
         "      <td> 2014</td>\n",
         "    </tr>\n",
         "    <tr>\n",
         "      <th>4</th>\n",
         "      <td> 4.1</td>\n",
-        "      <td>       MD</td>\n",
+        "      <td> MARYLAND</td>\n",
         "      <td> 2015</td>\n",
         "    </tr>\n",
         "    <tr>\n",
@@ -506,8 +506,8 @@
         "0  5.0  VIRGINIA  2012\n",
         "1  5.1  VIRGINIA  2013\n",
         "2  5.2  VIRGINIA  2014\n",
-        "3  4.0        MD  2014\n",
-        "4  4.1        MD  2015\n",
+        "3  4.0  MARYLAND  2014\n",
+        "4  4.1  MARYLAND  2015\n",
         "0  6.0        NY  2012\n",
         "1  6.1        NY  2013\n",
         "2  6.2        NY  2014\n",