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
- 24 Dec 2022, 11:33
- Forum: Data preparation, processing and pre-estimation analysis
- Topic: Convert mlogit data format into apollo data format
- Replies: 2
- Views: 3768
Convert mlogit data format into apollo data format
Dear authors, I would like to convert data from mlogit data format (generated vith the function dfidx: https://cran.r-project.org/web/packages/dfidx/vignettes/dfidx.html) in apollo data format. How can I easily and quickly do that? I found this function https://search.r-project.org/CRAN/refmans/supp...
- 12 Dec 2022, 17:52
- Forum: Post-estimation analysis/use of results
- Topic: Confidence intervals of aggregate market shares
- Replies: 1
- Views: 3113
Confidence intervals of aggregate market shares
Dear authors, I would like to compute the confidence intervals of the predicted aggregate market share of a choice, i.e. average of the predicted choice probabilities over all sample. I was wondering whether it can be done through the delta method function in Apollo and, if yes, how? If you do not r...
- 02 Dec 2022, 15:58
- Forum: Post-estimation analysis/use of results
- Topic: Simulation of new choice - market share of new product
- Replies: 3
- Views: 3738
Re: Simulation of new choice - market share of new product
Hi Stephane,
thanks for the quick reply. Yes, I looked at those. As you say, to perturb the attributes those examples suffice. To add to the choice set I would need to think more carefully. I will come back if still needed.
Best
L
thanks for the quick reply. Yes, I looked at those. As you say, to perturb the attributes those examples suffice. To add to the choice set I would need to think more carefully. I will come back if still needed.
Best
L
- 21 Nov 2022, 10:43
- Forum: Post-estimation analysis/use of results
- Topic: Simulation of new choice - market share of new product
- Replies: 3
- Views: 3738
Simulation of new choice - market share of new product
Dear authors, thank you for building this nice package. I would like to simulate a new choice within a logit model in Apollo. I would like to predict the aggregate market share of this new product and individual choice probabilities. I would like to do so it by altering the attributes of existing pr...