ApolloChoiceModelling forum

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 eigenvalu...

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. At ...

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 order...

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 tha...

PS: I have been trying to use Apollo to reproduce a multivariate ordered probit, using a Choleski representation of the covariance matrix between the components. I am successful in running the model, but it chokes on generating the summary. I have set the bottom break points for the ordered probit t...

Hello David, Given that it took me till today to check the forum, no apology necessary for the belated response. And thanks for your reply. My tentative way forward is to use the R package 'mvord' to estimate a multivariate ordinal model of the choice among futures, and then use the predicted probab...

Hello Stephane, Thanks for reading my post, and apologies for the lack of clarity. I have attached a document setting out my current theoretical description of the modeling problem. I hope this is a bit more clear. After you look at the attachment, my question might be more clear. Specifically: I ha...

I've got a SP off RP style model that has a multivariate ordered RP component. It is an SP off RP style as the 'RP' component is survey participants choosing a future they believe the most likely from a set of possible futures, and then the subsequent SP experiment is pivoted off of that chosen futu...