Many thanks, Stephane!
Best wishes,
Pamela.
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 13 matches
- 02 Mar 2023, 01:38
- Forum: Post-estimation analysis/use of results
- Topic: Internal validity & Root likelihood (RLH) test
- Replies: 2
- Views: 3204
- 02 Mar 2023, 01:35
- Forum: Post-estimation analysis/use of results
- Topic: Bootstrap estimation
- Replies: 7
- Views: 4737
Re: Bootstrap estimation
Hi Stephane, Many thanks for your response. I am running bootstrap estimations because to determine the relative “weight” of the attributes, I calculated relative scores, and I want to obtain a 95% confidence interval around each of them. I am following these two papers: -Genie, M.G., Ryan, M., &...
- 11 Feb 2023, 04:56
- Forum: Post-estimation analysis/use of results
- Topic: Post-estimation scenario analysis
- Replies: 1
- Views: 3055
Post-estimation scenario analysis
Dear Stephane and David, I run a couple of mixed logit models in which I asked respondents to choose between two unlabelled alternatives (i.e. Programme A vs Programme B), described by 6 attributes (each one with 3 levels). Now that I have the results, I would like to run a post-estimation scenario ...
- 08 Feb 2023, 15:49
- Forum: Post-estimation analysis/use of results
- Topic: Internal validity & Root likelihood (RLH) test
- Replies: 2
- Views: 3204
Internal validity & Root likelihood (RLH) test
Dear all, After running some mixed logit models, I would like to conduct a root likelihood (RLH) test to check for the consistency of the responses. This is, following: -Jonker et al (2022) The Sensitivity and Specificity of Repeated and Dominant Choice Tasks in Discrete Choice Experiments. Value in...
- 08 Feb 2023, 15:23
- Forum: Post-estimation analysis/use of results
- Topic: Bootstrap estimation
- Replies: 7
- Views: 4737
Re: Bootstrap estimation
Hi Stephane,
Many thanks!
May I ask you for suggestions when using bootstrap estimation with mixed logits? each model is taking various days to run.
Best wishes,
Pamela.
Many thanks!
May I ask you for suggestions when using bootstrap estimation with mixed logits? each model is taking various days to run.
Best wishes,
Pamela.
- 08 Feb 2023, 15:21
- Forum: Errors during model validation and/or estimation.
- Topic: Aapollo_saveOutput: Error in paste0(rep(...
- Replies: 3
- Views: 1246
Re: Aapollo_saveOutput: Error in paste0(rep(...
Hi Stephane, Many thanks! I found the solution. I was getting the error also with the on-screen output, and solved it by treating all variables as categorical. Checking for potential correlation between attributes has been challenging as my experimental design did not fully account for it (ended up ...
- 14 Dec 2022, 10:35
- Forum: Errors during model validation and/or estimation.
- Topic: Aapollo_saveOutput: Error in paste0(rep(...
- Replies: 3
- Views: 1246
Aapollo_saveOutput: Error in paste0(rep(...
Dear all, I am estimating a simple MNL with two interaction terms (code below).I have no problems running the code, but when I ask Apollo to save it (apollo_saveOutput(model)), I get the following error: Error in paste0(rep(" ", max(nchar(m)) - nchar(m)), m, collapse = "") : resu...
- 06 Dec 2022, 17:45
- Forum: Post-estimation analysis/use of results
- Topic: Bootstrap estimation
- Replies: 7
- Views: 4737
Bootstrap estimation
Dear all, I ran my MNL models and would like to use bootstrap estimation. I checked the Apollo manual (pp. 129), but I don't know how to add the bootstrap_settings (nRep) option to use 1000 bootstrap samples (default is 30). Could you please give me an example (code syntax)? Many thanks! Best wishes...
- 12 Oct 2022, 07:25
- Forum: Errors during model validation and/or estimation.
- Topic: Joint estimation on two SP datasets. Error: Duplicated componentName found
- Replies: 3
- Views: 1823
Re: Joint estimation on two SP datasets. Error: Duplicated componentName found
Thank you, Stephane!
Best wishes,
Pamela.
Best wishes,
Pamela.
- 08 Oct 2022, 12:18
- Forum: Errors during model validation and/or estimation.
- Topic: Joint estimation on two SP datasets. Error: Duplicated componentName found
- Replies: 3
- Views: 1823
Joint estimation on two SP datasets. Error: Duplicated componentName found
Hi Stephane, I am pooling data from two designs: -Design 1 has 6 attributes -Design 2 has the same attributes as Design 1, except for the last one "cost" (i.e. using only 5 attributes) In my dataset, I have two binary variables to indicate Apollo which dataset I'm using: "Done" f...