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 3 matches
- 13 Jun 2021, 11:35
- Forum: Feature requests
- Topic: GPU computing with Apollo
- Replies: 1
- Views: 9415
GPU computing with Apollo
Hi, I'm developing an EM-based algorithm to optimize choice weights. In the code, there is a loop with two MNL models estimated on a very large dataset (about 2GB). I have set the nCores variable to maximum cores minus one on my system (7 cores). But still, the run time takes too long. I'm wondering...
- 24 Aug 2020, 14:14
- Forum: Bug reports
- Topic: Get predictions from the model with many alternatives
- Replies: 3
- Views: 10952
Re: Get predictions from the model with many alternatives
Hi Stephane There is the same problem in the apollo_outOfSample function. I would appreciate if you debug this error: Error in apollo_mnl(mnl_settings, functionality) : Each element of "V" for model component "MNL" needs to be a scalar or a vector/matrix/cube with one row per obs...
- 06 Jul 2020, 20:37
- Forum: Bug reports
- Topic: Get predictions from the model with many alternatives
- Replies: 3
- Views: 10952
Get predictions from the model with many alternatives
Hi I have a question. After running the attached file I want to get predictions from the model. I use following commands: predictions_base = apollo_prediction(model, apollo_probabilities, apollo_inputs) summary(predictions_base[,3:ncol(predictions_base)]) But it causes this error: Error in apollo_mn...