Hi,

I use the following commands (logistic function) and Stata indicates "error r(430) convergence not achieved".

nl (choice=1/(1+exp(-{m}*(reward-y*exp(-{r}*t))))), cluster(id) nolog iterate(100)
nl (choice=1/(1+exp(-{m}*(reward-y/(1+{r}*t))))), cluster(id) nolog iterate(100)
nl (choice=1/(1+exp(-{m}*(reward-{alpha}*y*exp(-{r}*t))))), cluster(id) nolog iterate(100) level(99)
nl (choice=1/(1+exp(-{m}*(reward-{alpha=1}*y*(1-(1-{theta=3})*{r}*t)^(1/(1-{theta=3})))))), cluster(id) nolog iterate(100) level(99)

In the analysis, each respondent represents a cluster in which 75 binary choices are observed.
In the estimation, 23,925 observations are obtained, which corresponds to 319 distinct units of observation. The data looks like below.

What could be possible solutions?

Thanks.

Array