Hi
yes, I understood you were doing the factor analysis in another package. But you would never use factor scores in an ICLV model. What would do is check what groupings the factor analysis gives you and implement the ICLV model accordingly
Stephane
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
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- Check that the same issue has not already been addressed in the forum - there is a search tool.
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- 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 1035 matches
- 06 May 2024, 13:09
- Forum: Model estimation
- Topic: Need Advice on Using CFA Model Results from other software with ICLV in Apollo
- Replies: 3
- Views: 49
- 06 May 2024, 08:26
- Forum: Model specification
- Topic: Two level Nested Logit(NL) model specification for many alternatives
- Replies: 1
- Views: 29
Re: Two level Nested Logit(NL) model specification for many alternatives
Hi
apologies for the slow reply, your message had got lost
Did you try with lambda=1 as a starting value. Essentially, you should first see if you can replicate MNL
Stephane
apologies for the slow reply, your message had got lost
Did you try with lambda=1 as a starting value. Essentially, you should first see if you can replicate MNL
Stephane
- 06 May 2024, 08:22
- Forum: Model specification
- Topic: Start values for wta parameter
- Replies: 3
- Views: 2483
Re: Start values for wta parameter
Anat
apologies for the very slow reply.
I would use a lognormal distribution indeed. It's not about whether you have an opt-out or not, really, but about whether it would make sense behaviourally for people to have a diferently signed coefficient
Stephane
apologies for the very slow reply.
I would use a lognormal distribution indeed. It's not about whether you have an opt-out or not, really, but about whether it would make sense behaviourally for people to have a diferently signed coefficient
Stephane
- 06 May 2024, 08:19
- Forum: Model specification
- Topic: ICLV model specification in unlabelled form
- Replies: 8
- Views: 7500
Re: ICLV model specification in unlabelled form
Hi many apologies for the slow reply, your messages had been lost. First, "relative function convergence" is the BGW terminology for convergence, so that's fine. Second, in relation to your ASCs, you have: b_ASC*(asc_alt1==0) + b_ASC*(asc_alt1==1) which would mean the ASC is used for both ...
- 06 May 2024, 08:13
- Forum: Model specification
- Topic: adding context variables in class allocation model in latent class logit model
- Replies: 4
- Views: 1640
Re: adding context variables in class allocation model in latent class logit model
Hi
apologies for the slow reply
Your problem is caused by the effects coding you have implemented in the data. If you have only three levels, then you should also only estimated two parameters, not three. But I would suggest you just use dummy coding
Stephane
apologies for the slow reply
Your problem is caused by the effects coding you have implemented in the data. If you have only three levels, then you should also only estimated two parameters, not three. But I would suggest you just use dummy coding
Stephane
- 06 May 2024, 08:08
- Forum: Post-estimation analysis/use of results
- Topic: Elasticity analysis for unlabeled alternatives
- Replies: 1
- Views: 16
Re: Elasticity analysis for unlabeled alternatives
Hi many apologies for the slow reply, we had missed your post In relation to your questions: 1. Is classical elasticity analysis suitable for unlabeled cases? (While computations may be possible, I am interested in ascertaining the theoretical relevance of confirming sensitivity to specific attribut...
- 06 May 2024, 08:03
- Forum: Post-estimation analysis/use of results
- Topic: Out of sample results
- Replies: 3
- Views: 1727
Re: Out of sample results
Hi apologies for the slow reply So what you're finding is that you MMNL overfits the estimation data a bit more than MNL, but these differences are small. No, Apollo does not compute the % correct predicted metric as this is a misleading metric that is contrary to probabilistic choice models. It sho...
- 06 May 2024, 07:57
- Forum: Estimation results
- Topic: Unreasonable estimate for price and other attributes
- Replies: 7
- Views: 2560
Re: Unreasonable estimate for price and other attributes
Hi
apologies for the slow reply. Yes, correct on question 1, and no need to dummy code for price.
This could just be a case that your data gives unreasonable results, I can't see anything wrong with the model per se
Stephane
apologies for the slow reply. Yes, correct on question 1, and no need to dummy code for price.
This could just be a case that your data gives unreasonable results, I can't see anything wrong with the model per se
Stephane
- 06 May 2024, 07:55
- Forum: Errors during model validation and/or estimation.
- Topic: Error in estimating Latent class model with RP-SP data
- Replies: 3
- Views: 59
Re: Error in estimating Latent class model with RP-SP data
You'll need to be a bit careful here as combineModels is used inside the LC. probably best to work with temporary lists rather than P for RP and SP. You also need to tell it which ones to combine Something like this (look where I have used P_temp and where I have used P You probably need to make som...
- 06 May 2024, 07:47
- Forum: Errors during model validation and/or estimation.
- Topic: Error while estimating a Hybrid latent class choice model
- Replies: 3
- Views: 50
Re: Error while estimating a Hybrid latent class choice model
Hi
yes, please send me the data and code outside the forum and I'll have a look
Stephane
yes, please send me the data and code outside the forum and I'll have a look
Stephane