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 4 matches
- 08 Feb 2024, 12:16
- Forum: Model estimation
- Topic: Estimation of MNL and MMNL in WTP space issues
- Replies: 7
- Views: 3419
Re: Estimation of MNL and MMNL in WTP space issues
Hello, thank you so much for your help up to now. I have a further issue referring to the MMNL model in WTP space. I want to allow for random preferences for all ASCs as well as for the price parameter. However, I am trying - but did not succeed - to specify the price parameter distribution as a con...
- 05 Feb 2024, 08:14
- Forum: Model estimation
- Topic: Estimation of MNL and MMNL in WTP space issues
- Replies: 7
- Views: 3419
Re: Estimation of MNL and MMNL in WTP space issues
Below you can find the code with the output I get in the R console: ################################################################################ > ######################## MNL Pasta with ASC in WTP space ####################### > ##################################################################...
- 01 Feb 2024, 11:47
- Forum: Model estimation
- Topic: Estimation of MNL and MMNL in WTP space issues
- Replies: 7
- Views: 3419
Re: Estimation of MNL and MMNL in WTP space issues
Yes, you can find the code below. MNL: > rm(list = ls()) > apollo_initialise() Apollo ignition sequence completed > database <- read_excel("Dati_final.xlsx") > database <- subset(database, database$pasta==1) > apollo_initialise() Apollo ignition sequence completed > ### Set core controls >...
- 31 Jan 2024, 16:06
- Forum: Model estimation
- Topic: Estimation of MNL and MMNL in WTP space issues
- Replies: 7
- Views: 3419
Estimation of MNL and MMNL in WTP space issues
Hello, I am new to DCE estimation using Apollo. I am trying to estimate data from a labelled DCE using both a MNL and a Mixed MNL in WTP space, but I am ecountering some issues. The DCE cards included 4 alternatives (differing for the labelling attribute – the country of origin (COO), taking 4 level...