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st: how to cope with missing value in my case

From   Jia Xiangping <>
To   statalist <>
Subject   st: how to cope with missing value in my case
Date   Fri, 7 Oct 2005 15:36:46 +0800

Dear all,

I came across a problem about missing value. For example:(var1 var2
var3 are categorical variables)
index  var1   var 2   var3   var 4
  1        .       1        1
  2        1      1        .
  3        .       1       1

Now I want to get the frequecy of each observation and generate a
variable var4 which is the sum of frequency. So when I run -gen
var4=var1+var2+var3-, I should have got 2,2,1. But I got three missing
value. I'd like to say this problem is quite typical for missing value
topic. I tried to find answer online. But no clue now. Does anybody
can help me? Thanks

Xiangping JIA

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