a sequence of data. So, applying first-order differencing amounts to subtracting the value at the current step from the value at the next step (t_i+1 - t_i ).
In [Part 1](https://github.com/pw2/STAN-Blog-Tutorials/blob/main/STAN%20Part%201%20-%20Intro%20to%20STAN%20Code.Rmd) we laid the ground work for coding in `STAN` and ...
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