[R] Package 'ChoiceModelR' - Xbetas.csv? Rbetas.csv? betadraws?

[Uwe Ligges]

On 07.06.2013 21:25, Dimitri Liakhovitski wrote:
> Hope to get some clarity from the creators of a (wonderful) package
> ChoiceModelR. I am using the main function 'choicemodelr'.

Since we do not know if these "creators" are reading the list, why not 
ask them directly?

Best,
Uwe Ligges


>
> Everything works.
>
> ?choicemodelr says "average of MCMC draws of unit-level model coefficients
> are written to Xbetas.csv"
> Question 1: Is this a typo? The real file created in the working directory
> seems to be "Rbetas.csv"
> Questions 2: Are these the averages of the 'use' draws (specified in my
> choicemodelr statement)?
> Question 3: If I had constraints, I assume these averages will be "taking
> into account constraints", right?
>
> ?choicemodelr also says that choicemodelr produces an object that contains,
> among other things, two elemens:
>
>
>
> betadraw
>
> An ni by natt by floor(use/keep) array of MCMC random draws of unit-level
> multinomial logit model parameter estimates.
>
> betadraw.c
>
> An ni by natt by floor(use/keep) array of constrained MCMC random draws of
> unit-level multinomial logit model parameter estimates.
>
>
>
> If I do:
>
> apply(out$betadraw.c,c(1,2),mean)
>
> then what is the difference between the result and the file written to Disk?
>
> One difference I noticed:
>
> apply(out$betadraw.c, c(1,2),mean) contains as many columns as parameters,
> not as many columns as the number of levels.
>
> What else?
>
>
>
> Thank you very much!
>
>