egen tid=group(patient treat time)
Michael Blasnik
[email protected]
----- Original Message -----
From: "Janet Oliver" <[email protected]>
To: <[email protected]>
Sent: Monday, January 05, 2004 8:59 AM
Subject: st: Re: Unique Identifier
> I have a dataset that consists of a name (of various lengths), a treatment
> and a time period (0..5) with not all patients being seen at the six
times,
> and various clinical results. I wanted to create a unique numerical
> identifier based on name|treatment|time. I initally concatenated the
> variables "egen tid=concat(patient treat time)" and the tried to destring
> tid but this failed with the error message "tid contains non-numeric
> characters; no generate". I have examined the variables in the editor and
> cannot see any non-numeric characters.
> My questions are 1) Is there any way of determining non-numeric characters
> or 2) Is there an efficient method of combing name|treatment|time and
> generating a unique ID (preferably starting at 1 and increasing
> sequentially) - or should I just type in the IDs by hands.
> Many thanks.
> Janet
>
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