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 3 matches
- 08 Dec 2023, 10:09
- Forum: Estimation results
- Topic: Differences in Estimates in WTP space and preference space
- Replies: 5
- Views: 84726
Re: Differences in Estimates in WTP space and preference space
Dear Stephane, My concern is not only the WTP estimate being significantly different ( 190 VS 94) but also the signs on of the non random parameter estimates are different when I use the WTP space . How else could I calculate WTP estimates in Apollo without using the WTP space given I have 2 random ...
- 07 Dec 2023, 10:24
- Forum: Estimation results
- Topic: Differences in Estimates in WTP space and preference space
- Replies: 5
- Views: 84726
Re: Differences in Estimates in WTP space and preference space
Thank you Stephane for the prompt response.
So in terms of reporting WTP estimates, which would I adopt for my study given the mean of the WTP in MMNL is significantly different from that of the MNL.
Not mentioning that some parameter estimates have different signs.
What are my options then?
So in terms of reporting WTP estimates, which would I adopt for my study given the mean of the WTP in MMNL is significantly different from that of the MNL.
Not mentioning that some parameter estimates have different signs.
What are my options then?
- 07 Dec 2023, 06:35
- Forum: Estimation results
- Topic: Differences in Estimates in WTP space and preference space
- Replies: 5
- Views: 84726
Differences in Estimates in WTP space and preference space
Dear Stephane, Thank you for Apollo. I'm wondering why there is a significant difference in model estimates in WTP space with those in Preference space. I can not figure out the cause of this difference. Model 3 (MMNL-WTP) results are very different from Model 1 (MNL) and Model 2(MMNL-Preference) I ...