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st: RE: Decode categorical variable based on frequency


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Decode categorical variable based on frequency
Date   Wed, 30 Jul 2008 19:51:50 +0100

Yes. 

bysort rs1010: gen freq = _N 
egen group = group(freq rs1010)
replace group = group - 1 
labmask group, values(rs1010)

-search labmask- for locations. 

Nick
[email protected] 

Bhoom Suktitipat

Is there a possible way to automatically code a categorical variable
based on its frequency?

For example,

my variable contains ( a string variable)

. tab rs1010
 rs1010 |      Freq.     Percent        Cum.
------------+-----------------------------------
        1/1 |        353       64.77       64.77
        1/3 |        163       29.91       94.68
        3/3 |         29        5.32      100.00
------------+-----------------------------------
      Total |        545      100.00


If I use decode rs1010, gen(newrs) I got 1/1 as 0 instead.
Basically, I want to encode 3/3 (lowest frequency category) as 0, 1/3
as 1, and 1/1 as 2.


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