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 10 matches
- 05 May 2024, 12:52
- Forum: Errors during model validation and/or estimation.
- Topic: Error while estimating a Hybrid latent class choice model
- Replies: 3
- Views: 147
Re: Error while estimating a Hybrid latent class choice model
I tried to fix a couple of more parameters from Class B, however, I am getting a similar error message. If the dataset is also needed to rectify this, please let me know. The code is as follows: # ################################################################# # #### LOAD LIBRARY AND DEFINE CORE S...
- 02 Apr 2024, 11:49
- Forum: Errors during model validation and/or estimation.
- Topic: Error while estimating a Hybrid latent class choice model
- Replies: 3
- Views: 147
Error while estimating a Hybrid latent class choice model
Dear Prof. Hess and Dr. Palma, I am trying to run a Hybrid latent class choice model for my dataset. I have tried to develop the model in both ways (LVs as a part of class membership and LVs as a part of class specific model). However I am getting the following error: Error in f(init, x[ ]) : non-co...
- 04 Dec 2023, 12:14
- Forum: Errors during model validation and/or estimation.
- Topic: Unexpected numeric error while estimating eMDC2 model
- Replies: 5
- Views: 39771
Re: Unexpected numeric error while estimating eMDC2 model
Thnak you Prof. Hess for resolving this issues. The error with the associated step is resolved, however, I am now getting the following error message: Error in apollo_emdc2(emdc_settings, functionality) : Some mandatory elements are missing from 'emdc_settings' The running code is as follows: > # ##...
- 28 Nov 2023, 13:57
- Forum: Errors during model validation and/or estimation.
- Topic: Unexpected numeric error while estimating eMDC2 model
- Replies: 5
- Views: 39771
Re: Unexpected numeric error while estimating eMDC2 model
Thank you Prof. Hess for prompt response. Please find below the running code for the mentioned problem: apollo_initialise() Apollo ignition sequence completed > > ### Set core controls > apollo_control = list( + modelName ="eMDC_without_budget", + modelDescr ="Extended MDC with comple...
- 26 Nov 2023, 18:08
- Forum: Errors during model validation and/or estimation.
- Topic: Unexpected numeric error while estimating eMDC2 model
- Replies: 5
- Views: 39771
Unexpected numeric error while estimating eMDC2 model
Dear Prof. Hess and Dr. Palma, I am working on estimating an eMDC2 model that incorporates an implicit budget. The goal is to analyze travel time spent on trip purposes based on individuals' socio-economic profiles and I am not considering any outside good in my model estimation. However, I am getti...
- 09 Oct 2023, 13:51
- Forum: Errors during model validation and/or estimation.
- Topic: Error while running eMDC models
- Replies: 2
- Views: 8951
Re: Error while running eMDC models
Thank you Prof. Hess for timely response.
Yes, the code is working perfectly fine now after updating the Apollo version.
Yes, the code is working perfectly fine now after updating the Apollo version.
- 09 Oct 2023, 06:58
- Forum: Errors during model validation and/or estimation.
- Topic: Error while running eMDC models
- Replies: 2
- Views: 8951
Error while running eMDC models
Dear Prof. Hess and Dr. Palma, I am facing trouble while running the eMDC1 and eMDC2 model codes provided on the example page. I am using Apollo version 0.2.8. The error message is as follows: Testing likelihood function... Error in apollo_emdc(emdc_settings, functionality) : could not find function...
- 29 Aug 2023, 13:08
- Forum: Model specification
- Topic: Nested logit model with ranked choice
- Replies: 2
- Views: 5243
Nested logit model with ranked choice
Hello Professor Hess, In my data, my dependent variables (or choice alternatives) are ranked from 1 to 5 based on the preferences of respondents. Initially, I thought of applying a simple exploded logit model, however, during the literature study I found three of the choice alternatives to be correl...
- 27 Jun 2023, 13:07
- Forum: Model specification
- Topic: Mode choice model with non-RUM
- Replies: 3
- Views: 5277
Re: Mode choice model with non-RUM
Thankyou Prof. Hess for prompt response. To simply put, I want to develop a discrete choice model by utilizing cumulative prospect theory framework. As per my understanding to develop such a model we need additional data points like 1. Probablity Weighting Function 2. Value Function 3. Reference poi...
- 23 Jun 2023, 19:30
- Forum: Model specification
- Topic: Mode choice model with non-RUM
- Replies: 3
- Views: 5277
Mode choice model with non-RUM
Dear Prof. Hess and Dr. Palma As a part of my new study, I need to estimate a mode choice model for various trip purposes based on RUM, regret minimization and cumulative prospect theory. Based on my understanding the latter one allow for the inclusion of psychological factor related loss aversion, ...