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 6 matches
- 26 Jun 2023, 09:55
- Forum: Post-estimation analysis/use of results
- Topic: apollo_loadModel() cannot load the old model successfully
- Replies: 2
- Views: 3915
Re: apollo_loadModel() cannot load the old model successfully
Hi Prof Hess, Thank you very much for your prompt response! Now it works perfectly. I just found that the function “apollo_loadModel()” will automatically create ‘Users/yinglu’ at the beginning of a file path. When I used the code: model = apollo_loadModel('Documents/other paper/TRF/hybrid_models/MN...
- 26 Jun 2023, 08:40
- Forum: Post-estimation analysis/use of results
- Topic: apollo_loadModel() cannot load the old model successfully
- Replies: 2
- Views: 3915
apollo_loadModel() cannot load the old model successfully
Hi Prof Hess, I tried to use the function apollo_loadModel( ) to load an old model “MNL_socio_model.rds” but I received an error: Code: model = apollo_loadModel('/Users/yinglu/Documents/other paper/TRF/hybrid_models/MNL_socio_model') Error in value[[3L]](cond) : Cannot find or open /Users/yinglu//Us...
- 03 Nov 2020, 02:01
- Forum: Errors during model validation and/or estimation.
- Topic: error in LCCNL
- Replies: 1
- Views: 3824
error in LCCNL
Dear prof Hess, I attempted to use apollo_modeChoiceData to estimate latent class cross nested logit model (LCCNL). The tree structure of this LCCNL is the same as the Apollo_example_6. However, I received an error when running the code: Error in matrix(0, nrow = length(cnlNests), ncol = length(V)) ...
- 30 Apr 2020, 09:12
- Forum: Post-estimation analysis/use of results
- Topic: Latent class (nested) model - elasticity
- Replies: 4
- Views: 10230
Re: Latent class (nested) model - elasticity
Dear Prof Hess,
Now I understand. Thank you for your answers!
Ying
Now I understand. Thank you for your answers!
Ying
- 30 Apr 2020, 07:28
- Forum: Post-estimation analysis/use of results
- Topic: Latent class (nested) model - elasticity
- Replies: 4
- Views: 10230
Re: Latent class (nested) model - elasticity
Dear Prof Hess, Thank you very much for your reply. I still have one more question about this issue. When I put modelComponent=3 within prediction_settings, I think Apollo will show an error because I do not have three classes according to the code. However, it works and I get a value which is -0.17...
- 28 Apr 2020, 10:24
- Forum: Post-estimation analysis/use of results
- Topic: Latent class (nested) model - elasticity
- Replies: 4
- Views: 10230
Latent class (nested) model - elasticity
Hi prof Hess, I estimated a latent class nested logit model by using apollo_modeChoiceData.csv. I attempted to estimate the elasticity with regards to travel time for each of the four travel options across the two classes. The following is my syntax of elasticity calculations: ############ Class 1 e...