ApolloChoiceModelling forum

You should call apollo_searchStart just before calling apollo_estimate, as in: apollo_beta=apollo_searchStart(apollo_beta, apollo_fixed,apollo_probabilities, apollo_inputs) model = apollo_estimate(apollo_beta, apollo_fixed, apollo_probabilities, apollo_inputs) Be aware that apollo_searchStart can ta...

Hi, The formulation looks fine, but I would recommend using a different ASC for the base a treatment scenarios. Also, why does only one alternative have an ASC? Are the second and third alternatives unlabelled while the first one is labelled? Keep in mind that mixed logits potentially have multiple ...

Hi, You can obtain the mean and the s.d. of your lognormal parameters using the following code snippet: deltaMethod_settings <- list(operation="lognormal", parName1="cost_B_mu", parName2="cost_B_sig") apollo_deltaMethod(model, deltaMethod_settings) deltaMethod_settings ...

Hi, Apollo depends on multiple other packages to work. Among them, it depends on the package 'mnormt'. So for Apollo to work, mnormt must be installed. The issue is that the package mnormt requires R version 4 or later to work, but your system only has R version 3.6. As your R version is old, mnormt...

Hi, I am afraid we don't have much experience with a set-up such as yours, but we'll try to help the best we can. I would recommend starting by trying to install Apollo the regular way, that is typing: install.packages("apollo") If you do that, do you get en error message? if so, what erro...

Hi Sven, I did some googling, and apparently you have run into an RStudio bug, as reported in the following forum: https://github.com/rstudio/rstudio/issues/6692 I didn't go through the whole thread, but they do say not to expect a fix earlier than a few weeks from now. In the meantime, you could tr...

Hi Sven, I would recommend trying to install mvtnorm again from CRAN. I know you already did that, but I just checked CRAN and now both the r-release and r-oldrel are 1.1-1. So, with a bit of luck, installing it again might help. Also, do you have full administrator rights on your computer? It has h...

Hi Rafael, Attached to this post is a compressed folder containing four files: ILVLC.pdf The formulation of a latent class model with two latent variables: one influencing the class allocation, and another influencing the utility functions. ILVLC.R The implementation of the same model in Apollo. ILV...

Hi Malte, In your case, I would recommend creating 100 alternatives for all individuals, and then set their availability to reflect the actual number of alternatives that each individual faces. You can use a "for" loop to avoid writing 100 utilities. Below is an example. That piece of code...

Hi Richárd, Sadly, I am not familiar with the error you got. It is an error generated by the “parallel” package, and not from Apollo, so I can only guess at what the issue is. Are you running R in windows? If so, the first time you use Apollo (or any other package) with multithreading you should get...