Hi everyone,
I am wondering whether STATA already has a functionality to estimate latent class model for binary choice data. And further, latent class with class membership model. Which version of STATA should be used then?
thanks in advance, Marija
Marija, there is a STATA command for fitting latent class models called lclogit.. lclogit will provide the parameter estimates. You will also find some useful post-estimation commands like lclogitpr and lclogitml. Please see https://www.stata-journal.com/article.html?article=st0312 for details. You can also find more resources from the STATA mailing list.
I am not sure if STATA version will be an issue as long as you use the updated versions of the packages that the command uses..
One little addition maybe, in case you want to calculate WTP or WTA for different classes. Once you ran the analysis, STATA saves the coeffcients as
_b[choice1:coefficient] (for the first class and a coefficient named "coefficient")
_b[choice2:coefficient] (for the second class and a coefficient named "coefficient")
So choice in parenthesis, directly followed by the number of the class, followed by ":", followed by the name of the coefficient.
Here a minimal example:
local wtpc1
local wtpc2
forvalues i=1/2{
foreach att of varlist a b c d e f g{
local wtpc`i' `wtpc`i'' (`att': -10*_b[choice`i':`att']/_b[choice`i':PRICE])
}
}
lclogit choice a b c d e f g PRICE, ///
group(csn) id(RID) nclasses(2)
lclogitml, iter(20)
est store lc_noint
nlcom `wtpc1', post
est store WTP_c1
est restore lc_noint
nlcom `wtpc2', post
est store WTP_c2
Credits to Julian Sagebiel
Cheers,
Chris
two quick comments:
1) it is Stata, not STATA
2) there is a new version called lclogit2, which has more features, is much faster, and, if I remember correctly, allows for direct computation of WTP values.
Hope you can enjoy it.
Hi Marija. Which which version of Stata are you working on this? I tried to install the lclogit2 in Stata 17 but it did not work. Any help is appreciated. Thank you! Marija Bockarjova
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