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
- 10 May 2022, 13:48
- Forum: Model specification
- Topic: Simple procedure to determine optimal number of classes in a latent-class model?
- Replies: 1
- Views: 1750
Simple procedure to determine optimal number of classes in a latent-class model?
Hello Prof Hess In latent class models, selecting the "right" number of classes is important, a procedure, as you know, often done by testing the BIC / AIC / etc of variously-sized models. Because of the way models are specified, with the number of classes hard coded in both apollo_probabi...
- 28 Apr 2022, 23:37
- Forum: Model specification
- Topic: Latent class model with covariates, using categorical data
- Replies: 3
- Views: 2440
Re: Latent class model with covariates, using categorical data
You're right, the data are coded as factors. Is this, then how you'd recommend it: If I follow the manual's description of an EL model, I'd code the following in the apollo_probabilities() function V[["alt1"]] = ( b_price*price_1 + b_OTC*otc_1 + bSFX_low*(sfx_1=="low") + bSFX_med...
- 28 Apr 2022, 20:23
- Forum: Model specification
- Topic: Latent class model with covariates, using categorical data
- Replies: 3
- Views: 2440
Latent class model with covariates, using categorical data
Hi, Prof. Hess Apologies if this is in the manual, but I've been searching all day and I can't find it. I want to run an LC model on choice data I have. In both the demographic data and the alternative attribute data, some columns are continuous, some are binary, and some are categorical. I'm at a l...