ApolloChoiceModelling forum

Hi it's of course difficult to diagnose the problem without access to the data, but this looks at first hand like an identification issue. The zeta parameter becomes very large for one indicator while the taus become very wide too. I noticed that you used a different specification for the structural...

Hi Shan

yes, you should be able to make those parameters non-random where the standard deviations are not significant. Keep an eye on your model fit too to see if you're not losing fit by doing so

Best wishes

Stephane

Hi Brenna apollo_prediction makes use of the full distribution of the random coefficients. So it will take the estimated parameters and create draws for the coefficients at the person level, using the number of draws you specified in the settings for draws. It will then calculate the probabilities w...

Yes. that would make more sense

Dominik

I think what you need to do first is to analyse the choices in the two subsets. Your results are quite possibly driven by a situation where nobody in the private segment chooses option 6 or 8

Best wishes

Stephane

Hi Jason this is a common issue that happens to people when using Bayesian estimation through RSGHB. The issue is that you ran the whole file in one go. RSGHB, which is used by Apollo for Bayesian estimation, asks you to confirm before continuing the estimation. As you ran the whole file in one go, ...

Hi Wenjian so in effect you're treating each state as an "individual" in the model, with random heterogeneity across states. This is of course final methodologically, but you should be aware that with only 51 states, you only have a low number of "individuals" to which to fit a c...

Hi Suzana

this is the likelihood equivalent of Equation 11.5. I have clarified this in the manual for v.0.1.1. Please also consult Eqn 14 in https://www.caee.utexas.edu/prof/bhat/A ... egment.pdf

Best wishes

Stephane

Hi Wenjian the error message you received was not very intuitive, apologies fort that. We have improved this error message in version 0.1.1. However, the computation of conditionals is not possible when using workInLogs. To compute conditionals, we need the probability of an individual's entire sequ...

Dear Shan it is always impossible to know a priori which parameters are the right ones in terms of allowing for random heterogeneity. It is quite possible that random heterogeneity exists for most or all your coefficients. If you only allow for random heterogeneity in some of them, you will of cours...