Important: Read this before posting to this forum
- This forum is for questions related to the use of Apollo. We will answer some general choice modelling questions too, where appropriate, and time permitting. We cannot answer questions about how to estimate choice models with other software packages.
- There is a very detailed manual for Apollo available at http://www.ApolloChoiceModelling.com/manual.html. This contains detailed descriptions of the various Apollo functions, and numerous examples are available at http://www.ApolloChoiceModelling.com/examples.html. In addition, help files are available for all functions, using e.g. ?apollo_mnl
- Before asking a question on the forum, users are kindly requested to follow these steps:
- Check that the same issue has not already been addressed in the forum - there is a search tool.
- Ensure that the correct syntax has been used. For any function, detailed instructions are available directly in Apollo, e.g. by using ?apollo_mnl for apollo_mnl
- Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
- Make sure that R is using the latest official release of Apollo.
- Users can check which version they are running by entering packageVersion("apollo").
- Then check what is the latest full release (not development version) at http://www.ApolloChoiceModelling.com/code.html.
- To update to the latest official version, just enter install.packages("apollo"). To update to a development version, download the appropriate binary file from http://www.ApolloChoiceModelling.com/code.html, and install the package from file
- If the above steps do not resolve the issue, then users should follow these steps when posting a question:
- provide full details on the issue, including the entire code and output, including any error messages
- posts will not immediately appear on the forum, but will be checked by a moderator first. This may take a day or two at busy times. There is no need to submit the post multiple times.
Search found 17 matches
- 08 Jul 2021, 09:39
- Forum: Post-estimation analysis/use of results
- Topic: Effect of latent variable in interaction
- Replies: 10
- Views: 11104
Re: Effect of latent variable in interaction
Thank you so much for your help Stephane!
- 07 Jul 2021, 18:27
- Forum: Post-estimation analysis/use of results
- Topic: Effect of latent variable in interaction
- Replies: 10
- Views: 11104
Re: Effect of latent variable in interaction
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 use t...
- 05 Jul 2021, 14:34
- Forum: Post-estimation analysis/use of results
- Topic: Effect of latent variable in interaction
- Replies: 10
- Views: 11104
Re: Effect of latent variable in interaction
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("datab...
- 05 Jul 2021, 07:25
- Forum: Post-estimation analysis/use of results
- Topic: Effect of latent variable in interaction
- Replies: 10
- Views: 11104
Re: Effect of latent variable in interaction
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 &quo...
- 04 Jul 2021, 16:14
- Forum: Post-estimation analysis/use of results
- Topic: Effect of latent variable in interaction
- Replies: 10
- Views: 11104
Effect of latent variable in interaction
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 I us...
- 03 Feb 2021, 18:51
- Forum: Model estimation
- Topic: WTP-space estimates in latent class context
- Replies: 14
- Views: 19514
Re: WTP-space estimates in latent class context
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. However, it h...
- 31 Jan 2021, 20:51
- Forum: Model estimation
- Topic: WTP-space estimates in latent class context
- Replies: 14
- Views: 19514
Re: WTP-space estimates in latent class context
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 pri...
- 28 Jan 2021, 19:35
- Forum: Model estimation
- Topic: WTP-space estimates in latent class context
- Replies: 14
- Views: 19514
Re: WTP-space estimates in latent class context
Hi Stephane,
I used 0 starting value for every parameters, both in preference- and WTP-space estimation.
Peter
I used 0 starting value for every parameters, both in preference- and WTP-space estimation.
Peter
- 28 Jan 2021, 13:39
- Forum: Model estimation
- Topic: WTP-space estimates in latent class context
- Replies: 14
- Views: 19514
Re: WTP-space estimates in latent class context
- 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) : -2735.63...
- 26 Jan 2021, 18:09
- Forum: Model estimation
- Topic: WTP-space estimates in latent class context
- Replies: 14
- Views: 19514
WTP-space estimates in latent class context
Hi Stephane! I have a question about WTP-space estimates in latent class context. I think that, in terms of MNL and LC models I have to get exactly the same results for WTP-s (regardless of using WTP-space or computing with Deltha method). However, now I testing a stated choice database (It is not t...