Try specifying initial values, reducing ranges of constrained values, or reparameterizing the model

[Edward Patzelt]

Hi brms-users,

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.

[1] "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.

Thanks!

Edward

[Paul Buerkner]

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