Hi Stella
you probably want to add the xi statement before your command
xi: gllamm alternative i.age i.rate , i(individual) link(mlogit) expanded(individual choice o)
where age and rate are your categorical variables
Stata will take care of creating dummy variables for you
HTH
Hind
-----Original Message-----
> Date: Thu Apr 10 10:16:37 PDT 2008
> From: "Stella Capuano" <[email protected]>
> Subject: st: gllamm
> To: [email protected]
>
> Dear Statalisters,
> I have problems with stata command gllamm: it says that the likelihood
> cannot be computed because missing values were encountered during the
> computation. I don't understand what it means (my data do not have missing
> values).
> I have, hopefully correctly, reshaped the data in this way
> individual alternative choice
> 1 1 0
> 1 2 0
> 1 3 1
> 1 4 0
> etc...for each individual. The command I type is:
> gllamm alternative age1 age2 age3 age4 un_rate_1 un_rate_2 un_rate_3
> un_rate4, i(individual) link(mlogit) expanded(individual choice o)
> where age1, age2, age3, age4 are age dummies (each for one age category)
> and un_rate_1, un_rate_2, un_rate_3, un_rate_4 are regional unemployment
> rates (indeed the alternatives are regions.
> Honestly, I haven't understood properly what to specify in option i(),
> however I always get the same error message.
> Please, can anyone give me a hand?
> Thanks a lot,
> Stella
> --
> Stella Capuano
> c/o Collegio Carlo Alberto
> Via Real Collegio, 30
> 10024
> Moncalieri (TO)
>
>
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