fix typo

Author: drbenvincent

docs/source/notebooks/did_pymc_banks.ipynb

@@ -352,7 +352,7 @@
     "\n",
     "Let's just run through this to make sure we understand:\n",
     "* $\\mu_i$ is the expected value of the outcome (number of banks in business) for the $i^{th}$ observation.\n",
-    "* $\\beta_0$ is an intercept term to capture the basiline number of banks in business of the control group, in the pre-intervention period.\n",
+    "* $\\beta_0$ is an intercept term to capture the baseline number of banks in business of the control group, in the pre-intervention period.\n",
     "* `district` is a dummy variable, so $\\beta_{d}$ will represent a main effect of district, that is any offset of the treatment group relative to the control group.\n",
     "* `post_treatment` is also a dummy variable which captures any shift in the outcome after the treatment time, regardless of the receiving treatment or not.\n",
     "* the interaction of the two dummary variables `district:post_treatment` will only take on values of 1 for the treatment group after the intervention. Therefore $\\beta_{\\Delta}$ will represent our estimated causal effect."