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st: Fwd: Flexible models for dce
From
Arne Risa Hole <[email protected]>
To
statalist <[email protected]>
Subject
st: Fwd: Flexible models for dce
Date
Mon, 27 Jan 2014 09:38:09 +0000
Carla,
Your -mixlogit- (SJ/SSC) specification is correct if you want the mean
*and* SD of the coefficient for risk reduction vary with the age
group. If instead you wanted just the mean to vary, and the SD to be
the same for each age group you could specify:
mixlogit d p age2r age3r age4r, group(id) rand(r) nrep(500)
I would not use the -iter()- option here. If the algorithm doesn't
converge it is likely to indicate a problem with your model
specification - in that case the best advice is to simplify the model.
Note that if the respondents in your experiment make more than one
choice you should specify the -id()- option. See
http://www.stata-journal.com/article.html?article=st0133 for details.
I don't understand your second question but, yes, if you are
interested in estimating a latent-class conditional logit model then
-lclogit- is an appropriate command to use.
Arne
On 25 January 2014 11:49, Carla Guerriero <[email protected]> wrote:
> Dear Arne and Stata users,
> My experiment present three unlabelled alternatives to test individual
> willingness to pay for health risk reduction.
> I started with the classic conditional logit but I want to implement more
> flexible model..
> I fund that age is a significant predictor for risk reduction marginal
> utility .. my quesiotn is can I use the mixed logit command to estimate
> random parameter coefficient of interaction variable (risksize * agegroup) ?
> es.
> gen age1r = age1*r
> gen age2r =age2 *r
> gen age3r = age3*r
> mixlogit d p , group(id) rand(age1r age2r age3r age4r) iter(15) nrep(500)
> I used the iter(15) because it takes very long to estimate each iteration
> but I am not sure this is correct ..
>
> My second question is more complex I have collected in questionnaire so
> latent variables (binary measure of risk aversion) How can I include them in
> the latent class model ?
> should I use the lclogit command ?
> Thank you very very much
> Kind Regards
> Carla
>
>
> Carla Guerriero
>
> Research Fellow in Health Economics
> Health Policy Unit
> London School of Hygiene and Tropical Medicine
>
> Tel:(+44)02079588282
> Skype contact: carla.guerriero
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