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

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by Anna
25 Jan 2022, 15:34
Forum: Model specification
Topic: Include independent variables with missing values
Replies: 2
Views: 2344

Re: Include independent variables with missing values

Brilliant! That makes sense. The suggestions on stat stackexchange had me a little worried.

Thanks for the quick response!

Cheers
Anna
by Anna
25 Jan 2022, 15:14
Forum: Model specification
Topic: Include independent variables with missing values
Replies: 2
Views: 2344

Include independent variables with missing values

Hi, I am trying to find out how to handle missing data in the following case: I have some missing data (not at random) of a variable that significantly influences the choices in a model where I simply delete all the rows with a missing value. However, these observations are valuable and I would raht...
by Anna
07 Oct 2021, 07:51
Forum: Feature requests
Topic: File path of model outputs
Replies: 5
Views: 12232

File path of model outputs

Hi!

I am not sure if this is really a feature request or if I am just missing something. Is there a way to change the file path of where apollo writes the saved output to file? I was checking the apollo_saveOutput() function but couldn't see any specifiers.

Thanks,
Anna
by Anna
03 Feb 2021, 20:23
Forum: Models and estimation
Topic: Person attributes in unlabelled choices
Replies: 7
Views: 10032

Re: Person attributes in unlabelled choices

Hi Stephane,

thanks for the quick response! That makes sense. I've already tried it with my data and it works like a charm.

Thanks!
Anna
by Anna
01 Feb 2021, 21:01
Forum: Models and estimation
Topic: Person attributes in unlabelled choices
Replies: 7
Views: 10032

Person attributes in unlabelled choices

Hi, I'm trying to estimate a simple MNL using data from an unlabelled stated choice survey. I'm fine with the alternative specific attributes but would also like to include socio-demographic data. Is that possible? I have only ever estimated models using labelled data so I'm a little off at the mome...

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