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.

How to structure data from a binary forced stated choice experiment that was repeated 7 times per person?

Ask questions about data format and processing of data, including the use of pre-estimation functions in Apollo. If your question relates to a specific error you are getting, please provide some of the output.
Post Reply
Istillhavequestions
Posts: 2
Joined: 11 Feb 2021, 10:41

How to structure data from a binary forced stated choice experiment that was repeated 7 times per person?

Post by Istillhavequestions »

Hello

I just downloaded Apollo into R and I have two questions regarding my data.

Currently my file looks like this

personalID - task number (1-7) - side summer (1 or 2) - attributeA - attributeB - attributeC - priceAttribute - choice (1 or 0) - some personal info variables.

This is long instead of wide format if I am correct.

But the example data "apollo_modeChoiceData.csv" has the same format (multiple rows per person. This is why I wanted to know if I need to change something?

I also have a second question: My design is a completely randomised design. But within one attribute some levels appear more often than others as they are more important. Is there a way I can/should include this in my models?

Thanks in advance!
stephanehess
Site Admin
Posts: 974
Joined: 24 Apr 2020, 16:29

Re: How to structure data from a binary forced stated choice experiment that was repeated 7 times per person?

Post by stephanehess »

Hi

this is the wide (not long) format, which is correct for Apollo.

Regarding your attribute levels, no, you should not control for this in the model

Stephane
--------------------------------
Stephane Hess
www.stephanehess.me.uk
Istillhavequestions
Posts: 2
Joined: 11 Feb 2021, 10:41

Re: How to structure data from a binary forced stated choice experiment that was repeated 7 times per person?

Post by Istillhavequestions »

Dear Stephane,

thanks a lot!

I will try it that way!
Post Reply