make a long equation into two lines (#931)

Author: star1327p

docs/notebooks/negative_binomial.ipynb

@@ -554,8 +554,10 @@
     "### Model 2\n",
     "\n",
     "$$\n",
-    "\\log(\\mathbb{E}[Y_i]) = \\beta_1 \\text{Academic}_i + \\beta_2 \\text{General}_i + \\beta_3 \\text{Vocational}_i + \\beta_4 \\text{Math\\_std}_i\n",
-    "            + \\beta_5 \\text{General}_i \\cdot \\text{Math\\_std}_i + \\beta_6 \\text{Vocational}_i \\cdot \\text{Math\\_std}_i\n",
+    "\\begin{aligned}\n",
+    "\\log(\\mathbb{E}[Y_i]) &= \\beta_1 \\text{Academic}_i + \\beta_2 \\text{General}_i + \\beta_3 \\text{Vocational}_i + \\beta_4 \\text{Math\\_std}_i + \\\\\n",
+    "            & \\beta_5 \\text{General}_i \\cdot \\text{Math\\_std}_i + \\beta_6 \\text{Vocational}_i \\cdot \\text{Math\\_std}_i\n",
+    "\\end{aligned}\n",
     "$$\n",
     "\n",
     "In both cases we have the following dummy variables\n",
@@ -1188,9 +1190,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "dev",
+   "display_name": "Python [conda env:base] *",
    "language": "python",
-   "name": "python3"
+   "name": "conda-base-py"
   },
   "language_info": {
    "codemirror_mode": {
@@ -1202,7 +1204,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.7"
+   "version": "3.11.5"
   }
  },
  "nbformat": 4,