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 11 matches
- 17 May 2022, 08:38
- Forum: Model specification
- Topic: How can I know the choice probability of LC with EM algorithm?
- Replies: 1
- Views: 1847
How can I know the choice probability of LC with EM algorithm?
Dear Stephane, Hello, thank you for your effort with this wonderful tool. I am using the Latent Class model with EM algorithm. Mine is the binary choice of Stated Preference between conventional bus vs. New transport service. However, I have two questions related to this model. 1. When I increase th...
- 01 Apr 2022, 13:20
- Forum: Errors during model validation and/or estimation.
- Topic: Some variables do not influence the log-likelihood of your model!
- Replies: 1
- Views: 1844
Some variables do not influence the log-likelihood of your model!
Dear Stephane, Hello, this is Hyewon. I know there are several questions about this error message, but I cannot find the way same as mine and I think I code in the right way. Currently, I am using Apollo version 0.2.7. I am using ICLV. The choice part is the binary mixed logit model. I have four lat...
- 26 Oct 2021, 12:20
- Forum: Model specification
- Topic: When I increase the class of the Latent Class, the result is strange.
- Replies: 3
- Views: 4245
Re: When I increase the class of the Latent Class, the result is strange.
Dear Stephane, Thank you so much for your prompt and clear answer always. I tried the EM algorithm for the Latent Class models, following "example 28" and the manual which was released this year. However, the results got worse. :geek: Here I attach the code and the results. It is sad that ...
- 21 Oct 2021, 22:40
- Forum: Model specification
- Topic: When I increase the class of the Latent Class, the result is strange.
- Replies: 3
- Views: 4245
When I increase the class of the Latent Class, the result is strange.
Dear Stephane, Firstly, thank you so much for your contribution to this tool. I am estimating the latent class model, there are Binary choices, and I am trying to increase the classes from 2. The beta for the choice probabilities is "Total time" and "cost", the membership variabl...
- 04 Jun 2021, 14:35
- Forum: Estimation results
- Topic: Is the rho square of ordered logit is not applicable?
- Replies: 1
- Views: 3992
Is the rho square of ordered logit is not applicable?
Dear Stephane, I use ol_setting to use the ordered logit model. However, in the result,. ================================== Estimation method : bfgs Model diagnosis : successful convergence Number of individuals : 988 Number of rows in database : 8892 Number of modelled outcomes : 8892 Number of cor...
- 11 May 2021, 08:09
- Forum: Model specification
- Topic: Is it okay using apllo_weighting for propensity score weighting?
- Replies: 1
- Views: 3540
Is it okay using apllo_weighting for propensity score weighting?
Dear Stephane, I want to use propensity score weighting to control selection biases in experimental groups. The datasets are Stated Choice survey, and looks like as follows; ID choice attirbute1 attribute2 ... ipw 1 1 1 0 0.3478 1 3 0 1 0.3478 1 5 1 1 0.3478 2 3 0 1 3.7865 2 4 1 1 3.7865 2 3 0 1 3.7...
- 14 Apr 2021, 15:26
- Forum: Errors during model validation and/or estimation.
- Topic: Errors in ordered logit model
- Replies: 1
- Views: 4165
Errors in ordered logit model
Dear Stephane, I am trying to run the ordered logit model in Apollo. However, there are two issues. 1) The result is different from other packages. 2) The result converged and somehow come up, but producing the following errors; Calculating LL(0)... Calculating LL of each model component... There we...
- 07 Apr 2021, 07:10
- Forum: Model specification
- Topic: How can I integrate ordered logit instead of MNL in ICLV?
- Replies: 5
- Views: 6792
Re: How can I integrate ordered logit instead of MNL in ICLV?
Dear Stephane, This is Hyewon, again. I would add the result of the code also the framework of the model, again. I added the image last time, but it does not show, so I will add it again. https://ifh.cc/g/d37Snh.png The result of the model is shown as follows Model name : ICLV for conference_group3 ...
- 04 Apr 2021, 14:54
- Forum: Model specification
- Topic: How can I integrate ordered logit instead of MNL in ICLV?
- Replies: 5
- Views: 6792
Re: How can I integrate ordered logit instead of MNL in ICLV?
Dear Stephane, Thank you for your prompt reply. As I said before, I want to use ordered logit instead of MNL in the choice part in ICLV. I used ol_setting instead of MNL_setting in the utility part, it somehow works, but some of the results give n/a though it should have the value. Therefore, the pr...
- 25 Feb 2021, 16:03
- Forum: Model specification
- Topic: How can I integrate ordered logit instead of MNL in ICLV?
- Replies: 5
- Views: 6792
How can I integrate ordered logit instead of MNL in ICLV?
Dear Stephane, First of all, I really appreciate your effort in this wonderful package. I want to use the ordered logit model for the choice probability part instead of MNL because my choice part is a Likert scale from 1 to 5. However, the example code of ICLV is for MNL, so I need to revise some. C...