ApolloChoiceModelling forum

Dear Apollo team!

I would like to ask you about a specific case of the hybrid choice model.

What should I do in case my latent variable is a categorical dichotomous variable?

I understand that the choice model part can be easily solved through an interaction, e.g:
b_price_new=b_price + lambda*LV ...

Thank you so much for your help Stephane!

Hi Stephane,

thank you very much for your help!

I just tried to use the WTP-space transformation (it worked perfectly for the other models) in order to reach a consistent approach for all models analyzed (to avoid future criticism from reviewer).

Based on your suggestion, in this case I should ...

Hi Stephane,

I copy the code used to estimate the ICLV model.

rm(list = ls())

library(apollo)

apollo_initialise()

apollo_control = list(
modelName ="MLM_based_ICLV",
modelDescr ="MLM_based_ICLV",
indivID ="ID",
mixing = TRUE,
nCores = 4
)

database = read.csv("database.csv",header=TRUE ...

Hi Stephane!

Thank you for the quick and useful answer!

For solution one:
So, for example if I use WTP-space transformation (V_indication=b_indication+b_indication_shift_lambda*LV -> U=b_cost*(V_indication*Indication_alti +....), is it enough to interpret "b_indication" and ignore the "b ...

Hi David and Stephane!

Unfortunately, I have a problem with interpreting my ICLV model results.

I would like to estimate the following structure: (1) MNL model, (2) MNL model with latent variable, (3) Mixed logit model, (4) Mixed logit model with latent variable.

I have one latent variable, and ...

Hi Stephane!

Thank you for your answers!

It became completely understandable to me.

I'm just trying to test and compare results in some model specifications.

To this point, I have found that (on other databases) in case of MNL and LC models, the two approaches were completely the same ...

Thank you Stephane!

The log-likelihood function reached earlier the point of convergation but the received (WTP) parameters were near identical than I get with 0 starting values.

I don't understand how I get so different results by using deltha method and WTP-space.

with 0.01 starting values for ...

Hi Stephane,

I used 0 starting value for every parameters, both in preference- and WTP-space estimation.

Peter

- Results of two-class LC model (in preference space)

Model diagnosis : successful convergence
Number of individuals : 261
Number of observations : 2088

Number of cores used : 3
Model without mixing

LL(start) : -2293.902
LL(0) : -2293.902
LL(final, whole model) : -2043.342
LL(component_1 ...