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Search found 21 matches

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by DavidKL
09 Aug 2021, 20:33
Forum: Post-estimation analysis/use of results
Topic: Delta method in random parameter models
Replies: 14
Views: 20044

Re: Delta method in random parameter models

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...
by DavidKL
09 Aug 2021, 19:13
Forum: Post-estimation analysis/use of results
Topic: Delta method in random parameter models
Replies: 14
Views: 20044

Re: Delta method in random parameter models

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 ...
by DavidKL
08 Aug 2021, 15:41
Forum: Post-estimation analysis/use of results
Topic: Delta method in random parameter models
Replies: 14
Views: 20044

Delta method in random parameter models

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"]] ...
by DavidKL
29 Jul 2021, 18:11
Forum: Bug reports
Topic: Error message "duplicated componentName" in Hybrid Choice Model using Bayesian approach
Replies: 4
Views: 17336

Re: Error message "duplicated componentName" in Hybrid Choice Model using Bayesian approach

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...
by DavidKL
13 Jul 2021, 15:21
Forum: Model estimation
Topic: Interaction effect with ASC
Replies: 2
Views: 5676

Re: Interaction effect with ASC

Perfect, thanks for the help!
by DavidKL
13 Jul 2021, 10:43
Forum: Model estimation
Topic: Interaction effect with ASC
Replies: 2
Views: 5676

Interaction effect with ASC

Hi Stephane! I would like to use some sociodemographic variable in my utility function in order to analyse whether they have impact for choosing the opt-out alternative. I saw you use this approach in apollo_example_3: asc_bus_value = asc_bus + asc_bus_shift_female * female asc_air_value = asc_air +...
by DavidKL
19 Jun 2021, 07:44
Forum: Models and estimation
Topic: Choosing the best model
Replies: 2
Views: 7999

Re: Choosing the best model

Thank you Stephane!

It helped a lot! This is a very interesting topic for me.
by DavidKL
11 Jun 2021, 18:30
Forum: Models and estimation
Topic: Choosing the best model
Replies: 2
Views: 7999

Choosing the best model

Hi David and Stephane! I would like to ask how to choose the best fit model. 1. Which one is the most reliable information criterion? I would like to compare two MNL model. The second one is include several sociodemographic interactions, so have more parameters. I get lower log-likelihood, AIC and h...
by DavidKL
28 Apr 2021, 17:32
Forum: Post-estimation analysis/use of results
Topic: Latent class model WTP and post-estimation
Replies: 3
Views: 5530

Latent class model WTP and post-estimation

Hi David and Stephane! I have two question for you. 1. How can I explain that, when I get extremely large WTP value for a certain attribute in case of latent class model (in one class). For example: I have price attribute with 1$, 1.5$, 2$, 2.5$ levels for my analysed product/service and in one clas...
by DavidKL
28 Mar 2021, 22:05
Forum: Data preparation, processing and pre-estimation analysis
Topic: Price variable
Replies: 2
Views: 9341

Re: Price variable

Thank you for your help Stephane!

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