Please also provide the following information in addition to your question:
- Operating System: macOS 10.13.4
- brms Version: 1.10.0
We are trying to specify a relatively simple probit model:
fit <- brm(choice ~ 0 + cond + cond:V + (0 + cond + cond:V|subject),data=dat,family=bernoulli(“probit”))
However, we get the following error:
"Rejecting initial value:
Log probability evaluates to log(0), i.e. negative infinity.
Stan can’t start sampling from this initial value.
Initialization between (-2, 2) failed after 100 attempts.
Try specifying initial values, reducing ranges of constrained values, or reparameterizing the model.
 “Error in sampler$call_sampler(args_list[[i]]) : Initialization failed.”
In looking at the STAN users group it appears that it is possible the data is formatted incorrectly.