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RE: st: mlogtest after mlogit

From   Nick Cox <>
To   "''" <>
Subject   RE: st: mlogtest after mlogit
Date   Mon, 24 Oct 2011 12:20:46 +0100

I don't understand Muhammad's first comment, which requires a change of the data, or indeed why Chiara even tried it out. 

In broad terms, Stata [sic] is having difficulties reconciling different information. 

That needs to be explored by looking at what you have said to Stata, through input of data and commands. There is little information in your posts to let anyone help you. 

First off, you say that there are 9 categories, but in principle there could be 10, according to your -generate- and -replace- statements, but there could be fewer than that depending on values of variables such as -UE- and on whether later -replace- commands overwrite the results of earlier commands. 

Second, and more important: What was the -mlogit- command? Did you do anything to your data between -mlogit- and -mlogtest-? 


Muhammad Anees

Your test is offered by -wald- option after -mlogtest-. Hope this
gives you what you needed.

On Mon, Oct 24, 2011 at 3:42 PM, Chiara Mussida <> wrote:

> Thanks, unfortanately the problem remains also with recode

On 24 October 2011 12:13, Muhammad Anees <> wrote:

>> try with -recode 0=1 if UE==1- for all your categories, the problem
>> seems to be because -replace- might not have created the relevant
>> categories.

On Mon, Oct 24, 2011 at 2:59 PM, Chiara Mussida <> wrote:

>>> I run I mlogit with a dependent variables for 9 outcome categories. As
>>> postestimation checks I tried to carry out a test for the equality of
>>> coefs across categories: mlogtest, c
>>> before despalying the output of thus check, STATA (version 12) says:
>>>  mlogtest, c
>>> Problem determining number of categories.
>>> what does it mean? my dependent variable, transition, is built as follows:
>>> ge transition=0
>>> replace transition=1 if UE==1
>>> replace transition=2 if UN==1
>>> replace transition=3 if UU==1
>>> replace transition=4 if EU==1
>>> replace transition=5 if EN==1
>>> replace transition=6 if EE==1
>>> replace transition=7 if NE==1
>>> replace transition=8 if NU==1
>>> replace transition=9 if NN==1
>>> where each outcome is a transition or permanence in each labour market
>>> state (namely, Unemployment, Employment, Non labour force)

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