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Re: st: Identifying Experiment subjects that belong in both the Placebo and Experiment Groups
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: Identifying Experiment subjects that belong in both the Placebo and Experiment Groups
Date
Sun, 21 Oct 2012 12:44:33 +0100
This is an FAQ. See
How do I list observations in a group that differ on a variable?
http://www.stata.com/support/faqs/data-management/listing-observations-in-group/
bysort ID (Received) : gen bad = Received[1] != Received[_N]
Nick
On Sun, Oct 21, 2012 at 12:38 PM, Beatrice Benavidez
<[email protected]> wrote:
> I have a dataset like below but for thousands of subjects (IDs).
>
> However, in my experiment a particular subject may have received both
> the treatment and placebo at the same or different dates (such as
> person of ID 2 and ID 1 respectively). This occurrence would then
> invalidate the experiment. I would then like to find a way to identify
> and flag those subjects.
>
> Date ID Received
> 1/1 1 Treatment
> 1/1 2 Treatment
> 1/1 2 Placebo
> 17/1 1 Placebo
> 18/1 3 Treatment
>
> I know I'd have to do bysort ID: gen flag = 1 if ...
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