diff --git a/module3/exo2/exercice.ipynb b/module3/exo2/exercice.ipynb
index 286582a4504ce6499c167b49b2b6404aea3778a9..94ac5404577da645257ac8e99ba4613c7377e59c 100644
--- a/module3/exo2/exercice.ipynb
+++ b/module3/exo2/exercice.ipynb
@@ -3194,12 +3194,48 @@
     "sorted_data"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Choisir le 1er spetembre comme début de chaque période anuelle"
+   ]
+  },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 29,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "first_september_week = [pd.Period(pd.Timestamp(y, 9, 1), 'w')\n",
+    "                        for y in range(sorted_data.index[0].year,\n",
+    "                                       sorted_data.index[-1].year)]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "year = []\n",
+    "yearly_incidence = []\n",
+    "for week1, week2 in zip(first_september_week[:-1],\n",
+    "                        first_september_week[1:]):\n",
+    "    one_year = sorted_data['inc'][week1:week2-1]\n",
+    "    yearly_incidence.append(one_year.sum())\n",
+    "    year.append(week2.year)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Conertir en séries pandas\n",
+    "yearly_incidence = pd.Series(index = year, data = yearly_incidence)"
+   ]
   },
   {
    "cell_type": "code",
@@ -3224,37 +3260,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 26,
    "metadata": {},
    "outputs": [
     {
      "ename": "NameError",
-     "evalue": "name 'sorted_data' is not defined",
+     "evalue": "name 'first_september_week' is not defined",
      "output_type": "error",
      "traceback": [
       "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
       "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-9-e4ec19bfbf99>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      3\u001b[0m first_spetember_week = [pd.Period(pd.Timestamp(y, 9, 1), 'w')\n\u001b[0;32m----> 4\u001b[0;31m                         for y in range(sorted_data.index[0].year,\n\u001b[0m\u001b[1;32m      5\u001b[0m                                        sorted_data.index[-1].year)]\n",
-      "\u001b[0;31mNameError\u001b[0m: name 'sorted_data' is not defined"
+      "\u001b[0;32m<ipython-input-26-7e6b8a051dc5>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      8\u001b[0m \u001b[0myear\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      9\u001b[0m \u001b[0myearly_incidence\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 10\u001b[0;31m for week1, week2 in zip(first_september_week[:-1],\n\u001b[0m\u001b[1;32m     11\u001b[0m                         first_september_week[1:]):\n\u001b[1;32m     12\u001b[0m     \u001b[0mone_year\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0msorted_data\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m'inc'\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0mweek1\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0mweek2\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;31mNameError\u001b[0m: name 'first_september_week' is not defined"
      ]
     }
    ],
    "source": [
-    "# Choisir le 1er spetembre comme début de chaque période anuelle\n",
-    "\n",
-    "first_spetember_week = [pd.Period(pd.Timestamp(y, 9, 1), 'w')\n",
-    "                        for y in range(sorted_data.index[0].year,\n",
-    "                                       sorted_data.index[-1].year)]\n",
     "\n",
     "\n",
-    "year = []\n",
-    "yearly_incidence = []\n",
-    "for week1, week2 in zip(first_september_week[:-1],\n",
-    "                        first_september_week[1:]):\n",
-    "    one_year = sorted_data['inc'][week1:week2-1]\n",
-    "    assert abs(len(one_year)-52) < 2\n",
-    "    yearly_incidence.append(one_year.sum())\n",
-    "    year.append(week2.year)"
+    "\n"
    ]
   },
   {