Important: Read this before posting to this forum

  1. 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.
  2. 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
  3. Before asking a question on the forum, users are kindly requested to follow these steps:
    1. Check that the same issue has not already been addressed in the forum - there is a search tool.
    2. 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
    3. Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
    4. Make sure that R is using the latest official release of Apollo.
  4. If the above steps do not resolve the issue, then users should follow these steps when posting a question:
    1. provide full details on the issue, including the entire code and output, including any error messages
    2. 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

by PaulW
23 Apr 2021, 09:09
Forum: Bug reports
Topic: Error during MDCEV prediction
Replies: 6
Views: 12738

Re: Error during MDCEV prediction

Thank you very much !
by PaulW
22 Apr 2021, 09:01
Forum: Bug reports
Topic: Error during MDCEV prediction
Replies: 6
Views: 12738

Re: Error during MDCEV prediction

I sent you the data thank you very much
by PaulW
22 Apr 2021, 08:27
Forum: Bug reports
Topic: Error during MDCEV prediction
Replies: 6
Views: 12738

Re: Error during MDCEV prediction

I tested it in version 0.1.0 and 0.2.4 version 0.1.0: Error in if ((sum(lambda < V_trans[i, 2:NALT])) < (M)) { : missing value where TRUE/FALSE needed version 0.2.4: Error in if (M > sum(phk > lambda) || M > sum(phk > 0)) { : missing value where TRUE/FALSE needed Kind regards, Paul
by PaulW
21 Apr 2021, 18:17
Forum: Bug reports
Topic: Error during MDCEV prediction
Replies: 6
Views: 12738

Error during MDCEV prediction

Dear Apollo team, I'm encountering the following error while using apollo_prediction for my MDCEV model: Error in if (M > sum(phk > lambda) || M > sum(phk > 0)) { : missing value where TRUE/FALSE needed or in version 0.1.0: Error in if ((sum(lambda < V_trans[i, 2:NALT])) < (M)) { : missing value whe...
by PaulW
15 Mar 2021, 14:52
Forum: Model estimation
Topic: Fitting variant of MDCEV by coding probabilities within apollo_probabilities
Replies: 1
Views: 5569

Fitting variant of MDCEV by coding probabilities within apollo_probabilities

Hi, I'm currently trying to fit the Ly-profile for the MDCEV model. I coded the loglikelihoods and the model converged using the maxLik package. However, I would like to be able to estimate the model within the Apollo framework but currently I obtain the following error: "Error in apollo_insert...