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 15 matches

by marah
13 Aug 2022, 05:07
Forum: Models and estimation
Topic: Interpreting tables of coefficients
Replies: 6
Views: 5695

Re: Interpreting tables of coefficients

I just realised what you were asking for with the model (I think). I used simple multinomial logit models.
by marah
13 Aug 2022, 03:44
Forum: Models and estimation
Topic: Interpreting tables of coefficients
Replies: 6
Views: 5695

Re: Interpreting tables of coefficients

Thanks, that makes sense. I'm quite sure I did use all the possible best-worst combination as alternatives. I ran the following codes for my main table of BWS results: # ################################################################# # #### LOAD LIBRARY AND DEFINE CORE SETTINGS #### # ############...
by marah
10 Aug 2022, 06:12
Forum: Models and estimation
Topic: Interpreting tables of coefficients
Replies: 6
Views: 5695

Re: Interpreting tables of coefficients

Thanks for your reply. Sorry but what do you mean by the model? In the survey, respondents saw each barrier five times, completed eleven choice sets, and barriers were presented in groups of five. In each question, respondents were asked: “When you think about reasons that you haven’t [made specific...
by marah
09 Aug 2022, 09:00
Forum: Models and estimation
Topic: Interpreting tables of coefficients
Replies: 6
Views: 5695

Interpreting tables of coefficients

Hi, I have a table of results for best-worst scaling (using the apollo_combineModels method) and a table of results for a discrete choice experiment. In both tables, I provide coefficients, standard errors and p-values. My PhD supervisor has asked me to interpret the tables on a general level, inclu...
by marah
24 Mar 2022, 07:21
Forum: Post-estimation analysis/use of results
Topic: P-values for deltaMethod_settings
Replies: 4
Views: 3221

Re: P-values for deltaMethod_settings

Yes, that's what I was thinking, thanks for clarifying.
by marah
24 Mar 2022, 01:31
Forum: Post-estimation analysis/use of results
Topic: P-values for deltaMethod_settings
Replies: 4
Views: 3221

Re: P-values for deltaMethod_settings

Thanks Stephane.

For the second question, do you mean I put that in the list for the deltaMethod_settings? Hence using a Delta method approach? Or is there a way to conduct a joint F-test using a command like linearHypothesis?
by marah
23 Mar 2022, 06:41
Forum: Post-estimation analysis/use of results
Topic: P-values for deltaMethod_settings
Replies: 4
Views: 3221

P-values for deltaMethod_settings

I have two small questions about deltaMethod_settings: 1) Is there any way to get it to report p-values? If not, how do I use the bootstrap method to calculate confidence intervals? (I've read this is a possibility on the forum but can't figure out how it works based on the manual.) 2) If I want to ...
by marah
23 Mar 2022, 06:03
Forum: Model estimation
Topic: Mixed logit model difficulties
Replies: 4
Views: 6160

Re: Mixed logit model difficulties

Hi Stephane, Each survey respondent provided answers for 12 choice sets. Does that count as a long panel? I am using the most recent version of Apollo (I have checked this). And it starts going wrong even if I don't include any interactions at all but just stick to the attributes... When I use WorkI...
by marah
18 Mar 2022, 06:35
Forum: Model estimation
Topic: Mixed logit model difficulties
Replies: 4
Views: 6160

Mixed logit model difficulties

Hello, First, my apologies for asking yet another question. Thanks for all your help thus far with my learning of DCE estimation. I'm having difficulties running a code for mixed logit. I would like to make the preferences for only one attribute random. When I start with the basic form with only att...
by marah
16 Mar 2022, 04:58
Forum: Model estimation
Topic: Hybrid model
Replies: 1
Views: 5405

Hybrid model

Hi Stephane, I'm trying to estimate a hybrid choice model and am not sure what I've done wrong with the code. When it is at step apollo_speedTest(apollo_beta, apollo_fixed, apollo_probabilities, apollo_inputs, speedTest_settings), there is the error message: "Error in apollo_probabilities(b, ap...