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Re: st: suest mlogit equation not found error


From   Fernando Rios Avila <f.rios.a@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: suest mlogit equation not found error
Date   Fri, 20 Jul 2012 13:46:45 -0400

My Apologies.
I think i know what the problem is. Since I don't know how exactly
your data and results look like, i thought i might create a different
example.
. webuse sysdsn4

qui mlogit insure age if male==1, base(1)
     estimates store m1
qui mlogit insure age if male==0, base(1)
     estimates store m2
  suest m1 m2

  test ([m1_Prepaid=m2_Prepaid]) ([m1_Uninsure=m2_Uninsure])

I think this code does what you want to do (in a very simple
framework). You might need to adjust it accordingly.
Fernando

On Fri, Jul 20, 2012 at 1:24 PM, natalia malancu
<natalia.malancu@gmail.com> wrote:
> Hi Fernando,
>
> to my understanding & based on what I read in previous posts about -suest- that
> specification applies only when referring regress. I tried it anyway and
> I'm getting the same error.
>
> Natalia
>
>
>
>
> On Fri, Jul 20, 2012 at 6:45 PM, Fernando Rios Avila <f.rios.a@gmail.com> wrote:
>>
>> Hi Natalia,
>> I haven't personally done a Chow test using an Mlogit model, however I
>> believe the right syntax is:
>>  mlogit Y x1 x2 x3 if period==0, base (0)
>>  est store model1
>>  mlogit Y x1 x2 x3 if period==1, base (0)
>>  est store model2
>>
>>  suest model1 model2
>>  test [ model1_mean=mode2_mean]
>>
>> Look at example 2 of the -suest- help file.
>> Fernando
>>
>> On Fri, Jul 20, 2012 at 10:14 AM, natalia malancu
>> <natalia.malancu@gmail.com> wrote:
>> > Hi all,
>> >
>> > I estimate a mlogit model on two different periods of the same
>> > sample. Then I want to test if there is a structural change. My
>> > question is: how do I do Chow Test in stata in this case?
>> >
>> > At this point I tried using the -suest- command as follows:
>> >
>> > mlogit Y x1 x2 x3 if period==0, base (0)
>> > est store model1
>> > mlogit Y x1 x2 x3 if period==1, base (0)
>> > est store model2
>> >
>> > suest model1 model2
>> > test [ model1=mode2]
>> >
>> > but I keep receiving the following error:
>> >
>> > "equation model1 not found"
>> >
>> > I have also tried test[model1_Y=model2_Y] with similar limited success.
>> >
>> > Thanks for helping,
>> > Natalia
>> > *
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