ApolloChoiceModelling forum

Hi Stephane! Thank you very much for your answer, it is now clear and I was able to determine the true average using the unconditional function. I would like to ask that I can also do the WTP calculations with the unconditional function, e.g. wtp=unconditionals[[["b_attribute"]]/unconditio...

Hi! I would like to ask why I can estimate a positive parameter for the price coefficient for a random parameter logit specification? For the basic MNL model I estimate a negative coefficient, all results are correct, but for RPL whatever I do, the coefficient is always positive. I specify the rando...

Hi Apollo team! I had a pilot study with 54 respondents and I got an interesting results. I have 8 decision situations with 3 alternatives and an opt-out option. I got the following results for the choices: Overview of choices for MNL model component : alt1 alt2 alt3 altnc Times available 432.00 432...

Hi Stephane!

Thank you for the answer and help!

I will try to use the EM algorithm.

Best wishes,
David

Hi David!

Thank you very much!

It worked perfectly!

Best wishes,
David

Hi Stephane, thank you for the answer! I get very different solution not only in latent class model with random parameters, but also in latent class with fix parameters. My code and the results are the following in preference space: ### Clear memory rm(list = ls()) ### Load Apollo library library(ap...

Hi David! I have tried to use several starting values, but neither LC nor RLC model did not converge to the same solution in the WTP space as it was estimated in the preference space (e.g. I got 0.15 - 0.85 class probability values in preference-space, while 0.47-0.53 in WTP-space). I will try to ap...

Hi David! Thank you very much for your quick and helpful answer! I have estimated a two-class LC model with random parameters (only within class). I tried to use WTP-space approach, but class allocation probabilites were very different as in preference-space. So I assume that, my model in WTP-space ...

Hi David and Stephane! How could I calculate standard errors for mean WTP-s in case of random parameter models? I use the following formulation to calculate mean WTP-s: unconditionals=apollo_unconditionals(model,apollo_probabilities,apollo_inputs) attribute=unconditionals[["b_attribute"]] ...

Hi, I get the same error message. "Error in apollo_normalDensity(Qq2, functionality) : Duplicated componentName found (NormD). Names must be different for each component." My specification is the following: # ################################################################# # #### LOAD LIB...