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 5 matches
- 15 Sep 2020, 11:24
- Forum: Errors during model validation and/or estimation.
- Topic: Speedtest error
- Replies: 3
- Views: 5164
Re: Speedtest error
I see. Well, this is a pity because it means that the HB evaluation cannot be accelerated 3, 4 or more times. It would be great if this functionality could be added in some future releases. Btw, is Apollo being actively developed? I see really a lot of potential here for different improvements (one ...
- 15 Sep 2020, 11:19
- Forum: Post-estimation analysis/use of results
- Topic: Prediction on new data
- Replies: 6
- Views: 8173
Re: Prediction on new data
Hi, Sorry, perhaps I wasn't clear. Let's say that I build a model using fractional factorial, e.g. for attributes A (with levels A1 and A2) and B (with levels B1 and B2) I use only (A1, B1), (A1, B2), (A2, B2) combinations for building the model. These combinations are added to the database element ...
- 14 Sep 2020, 21:55
- Forum: Post-estimation analysis/use of results
- Topic: Prediction on new data
- Replies: 6
- Views: 8173
Re: Prediction on new data
You say that I can include new attribute levels in prediction that were not previously used in the model estimation process. That is exactly what I'm trying to do, but how do I do that? In the examples the only change is in the already existing data (e.g. increase the rail price by 1%). Isn't there ...
- 14 Sep 2020, 19:26
- Forum: Errors during model validation and/or estimation.
- Topic: Speedtest error
- Replies: 3
- Views: 5164
Speedtest error
Hi, I'm using Apollo_example_26.r and trying to add the speedTest (apollo_speedTest(apollo_beta, apollo_fixed, apollo_probabilities, apollo_inputs), all previously defined), but I'm getting the following error: -- ___Draws___ sec/ nCores inter intra progress LLCall RAM(MB) Error: $ operator is inval...
- 14 Sep 2020, 16:19
- Forum: Post-estimation analysis/use of results
- Topic: Prediction on new data
- Replies: 6
- Views: 8173
Prediction on new data
Hi, Let's assume that we have a model built on data that did not include all possible combinations of attributes (attribute levels), e.g. if data is a fractional factorial. Does Apollo have a prediction function to predict the results on a new data that was not initially included in the estimation/m...