added statistical models readme page

Author: DOSull

labs/statistical-models/README.md

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+#### GISC 422 T1 2021
+# Statistical models
+Some slides from another class to look at this week
++ [From overlay to regression](https://southosullivan.com/geog315/from-overlay-to-regression/)
++ [Introduction to regression](https://southosullivan.com/geog315/regression/)
++ [More on regression](https://southosullivan.com/geog315/more-on-regression/)
+
+And then [a notebook to explore](statistical-models.md). If you [download the zip file](statistical-models.zip?raw=true) then you'll find the data and the RMarkdown version of the notebook in there too.