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 4 matches
- 11 Aug 2023, 10:19
- Forum: Post-estimation analysis/use of results
- Topic: Post-estimation on an old model
- Replies: 3
- Views: 2937
Re: Post-estimation on an old model
Dear Stephane, Thank you for your reply. So, my computer was restarted when the code was in the stage of "post estimation 10%....20%....". The question is shall I recall the old model using apollo_loadModel and then run the sentence below only ? "model = apollo_estimate(apollo_beta, a...
- 26 Jul 2023, 11:58
- Forum: Post-estimation analysis/use of results
- Topic: Post-estimation on an old model
- Replies: 3
- Views: 2937
Post-estimation on an old model
Hi Stephane My computer restarted while the code was running (if I am not wrong, it was in the mid of post-estimation). I have a .rds file of my MMNL model. I successfully load it and I would like to continue with that. There is no clear instruction (step-by-step) in the Manual on how post-estimatio...
- 27 Jun 2022, 12:16
- Forum: Errors during model validation and/or estimation.
- Topic: "NaN" value as output of the apollo_probabilities(apollo_beta, apollo_inputs, functionality="estimate")
- Replies: 2
- Views: 1898
Re: "NaN" value as output of the apollo_probabilities(apollo_beta, apollo_inputs, functionality="estimate")
Hi Stephane, My utility function was including log for time and cost such as V = ASC + b_time * log(time) + b_cost * log(cost). I have discussed it with David and I have changed the log(x) to log (1+x) for both time and cost as per his suggestion: V = ASC + b_time * log(1 + time) + b_cost * log(1 + ...
- 23 Jun 2022, 12:26
- Forum: Errors during model validation and/or estimation.
- Topic: "NaN" value as output of the apollo_probabilities(apollo_beta, apollo_inputs, functionality="estimate")
- Replies: 2
- Views: 1898
"NaN" value as output of the apollo_probabilities(apollo_beta, apollo_inputs, functionality="estimate")
Hi Stephane and David, I have created my simple linear MNL model for the SP dataset and it works properly. However, when I have tried to convert the utility functions (cost and time) to log MNL, I am getting " NaN " values in my results for the following function. apollo_probabilities(apol...