st: syntax -chi2fit-

["Rajiv Mallick" <rmallick@hotmail.com>]

I am trying to use -chi2fit- test to compare distribution of my variable 
LOCN against Poisson distribution.  I am looking for some guidance on how to 
use -chi2fit- test, i.e.,
       - correct Stata syntax for the test,
       - do I need to first compute cdf of the variable,
       - in the Stata command how do I specify the theoretical distribution 
I am comparing the distribution of my variable against,
       - do I need to �collapse- the variable? If I do, then is it group 
wise or for any point.

You can see, any help in implementing this test will be appreciated.

My variable looks and feels like the following, and my attempt on �chi2fit- 
is below that.


Variable LOCN
----------------------------------------------------------------
. tabulate locn
       LOCN |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,984       64.35       64.35
          1 |      1,409       30.39       94.74
          2 |        185        3.99       98.73
          3 |         59        1.27      100.00
------------+-----------------------------------
      Total |      4,637      100.00

. summ locn
    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
        locn |      4637    .4218245    .6325427          0          3
----------------------------------------------------------------------


My Attempt on �chi2test-
----------------------------------------------------------------
. chi2fit locn poisson if loyald==1 pw(4) fw(4), bins(4) df(0)
variable poisson not found


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