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# Re: st: Keeping an entire cell based on an observation taking a particular value

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: Keeping an entire cell based on an observation taking a particular value Date Mon, 19 Mar 2012 21:21:23 +0000

```Same recipe. See

FAQ     . . . . . . . . . . . . . . . . . . . . . . .  True and false in Stata
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
8/05    What is true and false in Stata?
http://www.stata.com/support/faqs/data/trueorfalse.html

On Mon, Mar 19, 2012 at 9:14 PM, Dooruj Rambaccussing
<dooruj.rambaccussing@gmail.com> wrote:

> I was wondering if total would be appropriate if I wanted to find
> whether Xk==2 now (excluding other values) ?

> On Mon, Mar 19, 2012 at 8:57 PM, Dooruj Rambaccussing
> <dooruj.rambaccussing@gmail.com> wrote:
>> Thank you very much Nick. It is very helpful.
>>
>> On Mon, Mar 19, 2012 at 8:50 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>> I understand this as follows. You have panel data defined by variables
>>> -id- and -time- and a bundle of other variables -X*-.
>>>
>>> You want to keep any panels such that any value of -Xk- within a panel is 1.
>>>
>>> egen OK = total(Xk == 1), by(id)
>>> edit if OK
>>>
>>> If and only if that is what you want
>>>
>>> keep if OK
>>>
>>> Nick
>>>
>>> On Mon, Mar 19, 2012 at 8:33 PM, Dooruj Rambaccussing
>>> <dooruj.rambaccussing@gmail.com> wrote:
>>>
>>>> I am a beginner to stata. I was wondering if someone can help me with
>>>> the following issue:
>>>>
>>>> I got a dataset with an id and time, and certain observations say X1,
>>>> X2 ...... Xk. My variable  Xk has got missing values. I would like to
>>>> keep an id when a certain condition holds, suppose Xk(t) ==1, and I
>>>> would also like to keep the missing obs. Can anyone help me with this
>>>> ?
>>>

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```