@Ara_Winter Thanks, I’ll check those links/fixes out on my Mac.

The version of R I’m using is, R version 3.6.1 and the rstan version is 2.19.1.

BTW, I’m started running this same code in a windows machine after seeing @mike-lawrence’s reply about priors.

```
Click the Refresh button to see progress of the chains
starting worker pid=1340 on localhost:11532 at 19:10:16.821
starting worker pid=10276 on localhost:11532 at 19:10:17.702
starting worker pid=6988 on localhost:11532 at 19:10:18.571
starting worker pid=2124 on localhost:11532 at 19:10:19.512
SAMPLING FOR MODEL 'init' NOW (CHAIN 1).
Chain 1:
Chain 1: Gradient evaluation took 0.063 seconds
Chain 1: 1000 transitions using 10 leapfrog steps per transition would take 630 seconds.
Chain 1: Adjust your expectations accordingly!
Chain 1:
Chain 1:
Chain 1: Iteration: 1 / 5000 [ 0%] (Warmup)
SAMPLING FOR MODEL 'init' NOW (CHAIN 2).
Chain 2:
Chain 2: Gradient evaluation took 0 seconds
Chain 2: 1000 transitions using 10 leapfrog steps per transition would take 0 seconds.
Chain 2: Adjust your expectations accordingly!
Chain 2:
Chain 2:
Chain 2: Iteration: 1 / 5000 [ 0%] (Warmup)
SAMPLING FOR MODEL 'init' NOW (CHAIN 3).
Chain 3:
Chain 3: Gradient evaluation took 0.081 seconds
Chain 3: 1000 transitions using 10 leapfrog steps per transition would take 810 seconds.
Chain 3: Adjust your expectations accordingly!
Chain 3:
Chain 3:
Chain 3: Iteration: 1 / 5000 [ 0%] (Warmup)
SAMPLING FOR MODEL 'init' NOW (CHAIN 4).
Chain 4:
Chain 4: Gradient evaluation took 0.11 seconds
Chain 4: 1000 transitions using 10 leapfrog steps per transition would take 1100 seconds.
Chain 4: Adjust your expectations accordingly!
Chain 4:
Chain 4:
Chain 4: Iteration: 1 / 5000 [ 0%] (Warmup)
Chain 1: Iteration: 500 / 5000 [ 10%] (Warmup)
Chain 3: Iteration: 500 / 5000 [ 10%] (Warmup)
Chain 4: Iteration: 500 / 5000 [ 10%] (Warmup)
Chain 3: Iteration: 1000 / 5000 [ 20%] (Warmup)
Chain 2: Iteration: 500 / 5000 [ 10%] (Warmup)
Chain 3: Iteration: 1500 / 5000 [ 30%] (Warmup)
Chain 1: Iteration: 1000 / 5000 [ 20%] (Warmup)
Chain 4: Iteration: 1000 / 5000 [ 20%] (Warmup)
Chain 4: Iteration: 1500 / 5000 [ 30%] (Warmup)
Chain 3: Iteration: 2000 / 5000 [ 40%] (Warmup)
Chain 4: Iteration: 2000 / 5000 [ 40%] (Warmup)
Chain 3: Iteration: 2500 / 5000 [ 50%] (Warmup)
Chain 3: Iteration: 2501 / 5000 [ 50%] (Sampling)
Chain 4: Iteration: 2500 / 5000 [ 50%] (Warmup)
Chain 4: Iteration: 2501 / 5000 [ 50%] (Sampling)
Chain 4: Iteration: 3000 / 5000 [ 60%] (Sampling)
Chain 4: Iteration: 3500 / 5000 [ 70%] (Sampling)
Chain 4: Iteration: 4000 / 5000 [ 80%] (Sampling)
Chain 4: Iteration: 4500 / 5000 [ 90%] (Sampling)
Chain 4: Iteration: 5000 / 5000 [100%] (Sampling)
Chain 4:
Chain 4: Elapsed Time: 1551.54 seconds (Warm-up)
Chain 4: 2991.6 seconds (Sampling)
Chain 4: 4543.14 seconds (Total)
Chain 4:
Chain 2: Iteration: 1000 / 5000 [ 20%] (Warmup)
Chain 1: Iteration: 1500 / 5000 [ 30%] (Warmup)
Chain 3: Iteration: 3000 / 5000 [ 60%] (Sampling)
Chain 3: Iteration: 3500 / 5000 [ 70%] (Sampling)
```

And the last four steps started yesterday and still running. Maybe there’s something wrong with my model…???