RE: st: identify group of observations

[Richard Williams <Richard.A.Williams.5@nd.edu>]

At 01:23 PM 4/29/2004 +0100, Nick Cox wrote:
> Good point. However, as we're playing minor improvements,
> note this too needs a fix:
>
> gen grp = sum(flag == "01") if flag == ""
>
> or
>
> gen grp = sum(flag == "01") if mi(flag)
>
> or perhaps even
>
> gen grp = sum(flag == "01") if trim(flag) == ""
>
> to catch "missings" that are somehow spaces.
>
> Any more?
According to the original problem, flag is supposes to be coded "01" or 
"02".  Ergo, how about

gen grp = sum(flag == "01") if flag == "01" | flag =="02"

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