1. This uses a path that is only valid on your computer. use `system.file`...
2. However, since the goal of the vignette is to be educational, the objects in this RData that are required for the analysis should be stated explicitly, e.g.:

```R
prior <- data.frame(distn = "norm", parama = 0, paramb = 2, n = NA)
trait.data <- 

j.iter <- ...
j.chains <- ...
etc...
```
```