ApolloChoiceModelling forum

I have narrowed the problem down somewhat. I was loading the packages 'parallel' and 'future' as well as apollo. I was also running the apollo code inside an Rmarkdown chunk. Based on a bit of internet snooping, there seems to be some problems with Rstudio on Linux with multithreading. I suspect ...

Hello Stephane,

Thanks for the reply. The model ran successfully on a Windows machine, using 500 draws. On my Linux box it didn't. This suggests it might be an issue with the R compiled for my version of Linux.

John.

I have experienced some system problems estimating a hybrid choice mixed logit model. The code is long, so not including, and have not had the time to try and reproduce it with a code segment and simulated data.

I am running R through Rstudio on a Ubunto 22.04.5 LTS operating system, on a Dell ...

Hello,

I ran a choice experiment where respondents first chose their expected future level of the experiment attributes absent a policy change, and then used that expected future as a pivot for the choices offered to the respondents.

This choice situation would seem to have some of the same issues ...

Hello David,

I did a starting value search, and started with estimates from a previous model run with a larger data set. Those didn't give the error. The resulting estimates where nonsense, very large in absolute value. I updated apollo, and now it reports that the Hessian has some complex ...

Hello,

I am estimating a number of mixed multinomial logit models on choice experiment data. Most of my models solve fine. However, one model run on a subset of the data fails.

apollo_estimate iterates fine. It converges, and then proceeds through the parameter scaling and additional iterations ...

I too have a problem with multithreading.

Error in apollo_makeLogLike(apollo_beta, apollo_fixed, apollo_probabilities, :
Model components are inconsistent across workers. Try seting apollo_control$nCores=1

This occurs when estimating a hybrid model with two latent variables, estimated using an ...

Thanks, particularly for your test code, which is what lead me to see what was going on.

John.

Looking a bit further, the issue seems to be with my use of 'summary' instead of 'apollo_modelOutput'. Works fine when I use this to examine the results.

John.

Thanks for the example. It works on my computer. However, the error still occurs with my data.

To check on things, installed the latest version of R, updated apollo and all the other packages, and ran the analysis without loading any other packages. Also removed everything else from the database ...