ApolloChoiceModelling forum

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...

Hi Junghwan as discussed by Chorus & Kroesen, it is not advisable to make a change to the latent attitude in forecasting as the scale of this arbitrary. So e.g. a 10% increase is not a meaningful concept. What we did in the 2018 paper is to look at a situation where everyone adopted the attitude...

Hi Dominik so what you are doing here is to allow for differencesin the value for the ASCs and the marginal utility coefficients as a function of the condition. That's the right thing to do. When you allow for differences in all terms, then this is equivalent to estimating two separate models, but y...

Hi Sara

you need to install from the binaries rather than the soruce file

Best wishes

Stephane

Hi Sara

you need to use / instead of \

It is also possible to do this via the menu in RStudio (tools-install packages) which will make it easier for you

Stephane

Hi apollo_prediction uses only the posterior means, so I would be very careful in using it in the situation where some of your marginal utility parameters are actually given by sums of multiple model parameters. Even if that wasn't the case, you should be very careful with using posterior means as t...

Hi Eduardo

you have included the same terms in both utilities, so the model is not identified. Apollo is telling you that b_female (the first parameter it tries) cannot change the log-likelihood as it influences both utilities in the same way.

Best wishes

Stephane