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# No plot?

**tjmahr**#2

I had to fix some things to convert from markdown to R code (add `*`

to the stan code for multiplication and replace curly quotes to straight ones), but every single one of the plots worked for me. The only weirdness is that when 6 parameters are plotted on a 2 x 2 grid via a for-loop the first plot will immediately be replaced in the viewer with the next set of plots.

This does have a typo though. `pairs`

should be `pars`

, but this doesn’t break any plots.

```
traceplot(fit,int_sample=TRUE,pairs=c(‘alpha’,‘beta’))
```

This should just be

```
mu = beta0 * com + beta1 * pri + ...
rat ~ normal(mu, sigma);
```

You’ll need to make everything like `com`

a vector.

I’d also recommend declaring `beta`

as a vector, using `beta ~ normal(0, 1)`

and then replacing `beta0`

with `beta[1]`

and so on.

This can just be a one-liner

```
real<lower = 0> sigma = exp(-ln_sigma);
```

But then I wouldn’t call `ln_sigma`

that as it’s really the negation of log sigma if I’m reading this right. I have no idea why you’d negate here as `ln_sigma`

gets a `normal(0, 1)`

prior, which is symmetric around zero, so it doesn’t do anything other than add a little drag and reverse signs.