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  1. 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.
  2. 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
  3. Before asking a question on the forum, users are kindly requested to follow these steps:
    1. Check that the same issue has not already been addressed in the forum - there is a search tool.
    2. 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
    3. Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
    4. Make sure that R is using the latest official release of Apollo.
  4. If the above steps do not resolve the issue, then users should follow these steps when posting a question:
    1. provide full details on the issue, including the entire code and output, including any error messages
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Search found 7 matches

by idserrano
30 Mar 2021, 03:34
Forum: Model specification
Topic: ordinal logit using second-order measurement component
Replies: 6
Views: 45324

ordinal logit using second-order measurement component

Dear developers of Apollo, I’m trying to estimate an ordinal logit using a second-order measurement component for the latent variables (LVs).
I attached de path diagram of the model to explain me better. However, when I run apollo_estimate I got the following error:

Error in apollo_validate ...
by idserrano
30 Mar 2021, 03:00
Forum: Model specification
Topic: ordinal logit using second-order latent variables
Replies: 6
Views: 19268

Re: ordinal logit using second-order latent variables

Thanks, prof very useful your suggestion

Bests
by idserrano
27 Mar 2021, 00:03
Forum: Model specification
Topic: ordinal logit using second-order latent variables
Replies: 6
Views: 19268

Re: ordinal logit using second-order latent variables

Prof Hess, I solved the problem in my code. It was that I specified the second-order latent variable in the wrong form:

randcoeff[["gov"]] = gamma_nat_gov * nat_gov + gamma_loc_gov * loc_gov

And the correct form is:

randcoeff[["gov"]] = gamma_nat_gov * randcoeff[["nat_gov"]] + gamma_loc_gov ...
by idserrano
22 Mar 2021, 21:04
Forum: Model specification
Topic: ordinal logit using second-order latent variables
Replies: 6
Views: 19268

Re: ordinal logit using second-order latent variables

Thanks for the reply prof Hess, I created the randCoeff nat_gov this:

apollo_draws = list(
interDrawsType="mlhs",
interNDraws=1000,
interUnifDraws=c(),
interNormDraws=c("eta_nat_gov"),
intraDrawsType='',
intraNDraws=0,
intraUnifDraws=c(),
intraNormDraws=c()
)
randcoeff[["nat_gov ...
by idserrano
21 Mar 2021, 18:24
Forum: Model specification
Topic: ordinal logit using second-order latent variables
Replies: 6
Views: 19268

ordinal logit using second-order latent variables

Dear developers of Apollo, first, thanks for this powerful and flexible package. It’s amazing!

I’m trying to estimate an ordinal logit using second-order latent variables (LVs). I attached de path diagram of the model to explain me better. The idea is to describe how specific groups can change the ...
by idserrano
29 May 2020, 16:54
Forum: Errors during model validation and/or estimation.
Topic: ICVL Model Identification issues
Replies: 3
Views: 12391

Re: ICVL Model Identification issues

Thanks for your answer prof. Hess.

I would like to ask you another question: Can I use different ordinal indicator with different Likert scale in the measurement model? I mean, I want to explain de LV "confidence" with "ol_settingsIP6" which is a variable with a Likert scale 1 to 5; and "ol ...
by idserrano
24 May 2020, 20:16
Forum: Errors during model validation and/or estimation.
Topic: ICVL Model Identification issues
Replies: 3
Views: 12391

ICVL Model Identification issues

Hi for all members.
Thanks for this amazing package Apollo.
I'm trying to run a ICVL model with 3 LV. First, I ran the ICVL only with 1 LV in order to get good initial values for the full model.
The problem is that the estimated paramaters related to "IP7" indicator are to big when I include the 3 ...