ApolloChoiceModelling forum

Good morning Stephane,

I have sent you an email with the code + data. By the way, the latent class model works fine if I don't estimate a joint model, i.e. omit the dual response part. However, I am still a little lost on what is causing the problem with the joint model.

Nico

Thank you very much.

I just realised that I didn't respond to your suggestion to use bootstrapping to estimate the standard errors. I have read the Apollo manual, but this is probably computationally too burdensome.

Best
Nico

Hi Stephane, Thank you very much for your answer. I suspect that the estimation problems may have something to do with the complexity of the models: HCM in WTP space and/or a high number of latent variables (three or four with several indicators each) and/or several model components (e.g. using LV t...

Hello everyone, I have a rather general question regarding model identification. Following the discussions in the forum, I learned that NaNs for the standard errors in the output point to problems in model specification/identification. However, most forum posts are devoted to models where NaNs appea...

Perfect, thanks a lot!

Hi Stephane, thank you very much for your quick reply. Unfortunately I have to consult you again, because I get an error message when estimating the model (classical estimation). With Apollo v0.2.4: Pre-processing likelihood function... Preparing workers for multithreading... Error in checkForRemote...

Hi Stephane, ok, I'm on it and will write to the developers of the package 'RSGHB' and keep you posted. The problem with this two step approach and Apollo I encountered is the following: Settings modelname, gVarNamesFixed , gVarNamesNormal , gDIST , svN and FC should not be included in apollo_HB , a...

Hi Stephane, thanks for the fast reply! I saw this approach for the first time in your paper, but nowhere else. In other papers, different socio-demographic characteristics are usually used as explanatory variables for the latent variables and as covariates. But just to get this straight: Something ...

Hello Stephane, thanks for the answer. If I understand it correctly, then the output from the first step can simply be integrated in the second step. Example: After step 1: ### Save priors for step 2 saveRDS(model$F_convergence, file = "./priors_step2/FC_step1.rds") # A vector of starting ...

I would like to ask another question about ICLV model specifications: Is it appropriate to use the same socio-demographic characteristics as explanatory variables for both the latent variable and as covariates for the utility coefficients? For example, let us assume I would like to test whether gend...