ApolloChoiceModelling forum

Hi, When I try to estimate a model, I get the following error: Error in rowsum.default(log(tmp[[s]]), group = indivID, reorder = FALSE) : incorrect length for 'group' I sent the code and data offline. I believe the issue has something to do with there only being one random variable with a fixed mean...

Stephane,

I can't figure out how exactly a very high z_i would fit the model better. I'll let you know if I find more information, and please let me know if you'd like to look into it yourself.

Tomás

Hi Stephane,

So sorry, I just realized it was a mistake on my part. In the MNL settings, I specified ows (no r) instead of rows. I guess that produced some kind of mistake in the sampling procedure.

It might be useful to have some kind of error message for this in the future.

Thanks again

Hi David and Stephane, I am estimating two ICLVs (different data and model specifications) where at least one of the indicators I'm interested in is a binary outcome. The measurement function for that indicator is a binary logit, and the "utility" is equal to U = c_0 + z_1 * LV. I'm also u...

Hi,

I know that scaling is important using classical estimation because very large or small numbers can introduce issues into matrix manipulation. Is it as important in a Bayesian setting?

Thanks!

Hi, I'm estimating an HB mixed logit model. I'd like to specify some parameters to follow a distribution that is not one of the ones included in the RSGHB package. I'd specifically like to build a Bernoulli random variable. In classical estimation, what I would do is define a Normal random error com...

Thank you Stephane!

Hi Stephane and David, I'm trying to estimate a model where HB == TRUE and one of the parameters distributes JSB between 0 and 1. Unfortunately, an error message keeps popping up. Here's a part of a reproducible example using apollo_modeChoiceData: [database, etc.] apollo_beta=c(asc_car = 0, asc_bus...

Hi David and Stephane,

I also bumped into this issue when I tried to use more than one core (nCores = 1 works fine). This happened in a Mac and a Windows machine running Apollo v0.2.4. If you haven't been able to track down the problem, I can also share my code and dataset.

Thanks,

Tomás

Hi, I'm estimating a multinomial logit model that has many observations per individual (4,303 observations, 46 individuals, 20 alternatives). An extremely simple model (ASCs + one alternative-specific parameter) produces very large robust standard errors. What could be the source of this issue? Some...