Tim
could you please also share the output?
Thanks
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- 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
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- 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
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Search found 1034 matches
- 01 Jul 2020, 13:17
- Forum: Estimation results
- Topic: Could the LL of a full model worse than that for the reduced model?
- Replies: 12
- Views: 18458
- 28 Jun 2020, 16:36
- Forum: Errors during model validation and/or estimation.
- Topic: Errors when using sobol draws in RPL
- Replies: 3
- Views: 6259
Re: Errors when using sobol draws in RPL
Hi Tim
Could you please share your code and the full output you see so we can investigate?
Thanks
Stephane
Could you please share your code and the full output you see so we can investigate?
Thanks
Stephane
- 27 Jun 2020, 22:22
- Forum: Models and estimation
- Topic: Alternative specific contants in unlabelled form
- Replies: 4
- Views: 8349
Re: Alternative specific contants in unlabelled form
Peter whether the second is correct depends on what happens in your data. In theory, and this is a point that is misunderstood by many, you should always have a full set of ASCs. This is where the distinction that people make between "labelled" and "unlabelled" is not helpful. Ra...
- 27 Jun 2020, 12:30
- Forum: Models and estimation
- Topic: Alternative specific contants in unlabelled form
- Replies: 4
- Views: 8349
Re: Alternative specific contants in unlabelled form
Peter
only differences in utility matter. If the ASCs are not random, then it makes no difference which ASC you normalise. The differences between them will remain the same
Stephane
only differences in utility matter. If the ASCs are not random, then it makes no difference which ASC you normalise. The differences between them will remain the same
Stephane
- 23 Jun 2020, 18:09
- Forum: Model specification
- Topic: Are latent variables in Hybrid choice model correlated?
- Replies: 7
- Views: 6307
Re: Are latent variables in Hybrid choice model correlated?
Hi Rafael in Apollo, latent variables are just random components in the same way as random coefficients in a mixed logit model. Whether or not they are correlated depends entirely on you and the specification you use. So if you have: apollo_draws = list( ... interNormDraws = c("eta1","...
- 23 Jun 2020, 17:37
- Forum: Post-estimation analysis/use of results
- Topic: Conditionals from a latent class mixed logit
- Replies: 4
- Views: 10810
Re: Conditionals from a latent class mixed logit
Hi Jose one initial comment. You have 15 continuous random parameters in your model, but you're using Halton draws. Please try to use some other type of draws. Beyond say 5 dimensions, Halton draws are so highly colinear that they should not be used. In terms of what you need, I've writen the below ...
- 22 Jun 2020, 21:06
- Forum: Post-estimation analysis/use of results
- Topic: Conditionals from a latent class mixed logit
- Replies: 4
- Views: 10810
Re: Conditionals from a latent class mixed logit
Hi Jose when combining latent class with continuous mixtures, there are several different ways of doing so, especially a distinction between mixing inside the classes and mixing of the class allocation probabilities. A generic function like the apollo_conditionals or apollo_lcConditionals would then...
- 21 Jun 2020, 18:49
- Forum: Post-estimation analysis/use of results
- Topic: Estimation of predictions for a joint RP-SP MNL model
- Replies: 2
- Views: 5060
Re: Estimation of predictions for a joint RP-SP MNL model
Hi in estimation, you maximise the log-likelihood of the joint model, i.e. the object P[["model"]] which is given as the product of the RP and SP choices. But in prediction, you obviously predict individual choices, not products of RP and SP choices. That's why in prediction, if your model...
- 13 Jun 2020, 11:11
- Forum: Model estimation
- Topic: How to cluster standard errors at individual level
- Replies: 2
- Views: 6077
Re: How to cluster standard errors at individual level
Hi this happens automatically. Please note this is explained on the website and in the manual. Here is the text from the website: How can I capture the panel structure of my data in Apollo? The treatment of panel data depends completely on the model being used. Whenever the data contains multiple ch...
- 12 Jun 2020, 11:33
- Forum: Model estimation
- Topic: Parallel computing MXL
- Replies: 9
- Views: 30017
Re: Parallel computing MXL
Sven
we've had problems with R4.0 though it works on our machines now with parallel too. Can I suggest that you try to reinstall Apollo as well as updating libraries that Apollo uses (Rcpp, maxLik, mnormt, mvtnorm, graphics, coda, sandwich, randtoolbox, numDeriv, RSGHB, parallel, Deriv)
Stephane
we've had problems with R4.0 though it works on our machines now with parallel too. Can I suggest that you try to reinstall Apollo as well as updating libraries that Apollo uses (Rcpp, maxLik, mnormt, mvtnorm, graphics, coda, sandwich, randtoolbox, numDeriv, RSGHB, parallel, Deriv)
Stephane