adding last markdown

Author: jjackson-eco

README.md

@@ -7,11 +7,12 @@
 
 Here I have put together my lecture notes from the Statistical Rethinking book (second edition) by Professor Richard McElreath, which can be found [here](https://xcelab.net/rm/statistical-rethinking/). The note files are split by chapters of the book. However, the note headings follow the lectures from Winter 2019 that are presented here on [YouTube](https://www.youtube.com/channel/UCNJK6_DZvcMqNSzQdEkzvzA), and there are some slight divergences between the lectures and the chapters of the book - particularly later on.
 
-Due to the computation involved in running the Markov chains for GLM and mixed effects models, the notes are split between 3 `R markdown` files:
+Due to the computation involved in running the Markov chains for GLM and mixed effects models, the notes are split between 4 `R markdown` files:
 
 1. Chapters 1-8 - `Statistical_Rethinking_1_8.Rmd`
 2. Chapters 9-12 - `Statistical_Rethinking_9_12.Rmd`
 3. Chapters 13 & 14 - `Statistical_Rethinking_13_14.Rmd`
+4. Phylogenetic regression - `Phylogenetic_regression.Rmd`
 
 These markdown files are also accompanied by their resultant html files - again to save on computation.
 
@@ -26,6 +27,9 @@ library(ggridges)
 library(rstan) # Follow the instructions at https://mc-stan.org/users/interfaces/rstan for installation
 library(rethinking)
 library(dagitty)
+require(MASS)
+require(ellipse)
+require(ape)
 ```
 
 ### Happy Bayesian-ing :)