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Re: st: lowest value in a series of variables in wide data
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: lowest value in a series of variables in wide data
Date
Tue, 28 May 2013 18:37:33 +0100
Should be a varlist with two or more variables is not an expression.
Nick
[email protected]
On 28 May 2013 15:51, Nick Cox <[email protected]> wrote:
> The -egen- function -min()- takes an expression, but a varlist is not
> an expression. (Loosely, an expression can be evaluated as a single
> value.)
>
> It sounds as if you want first -rowmin()- not -min()-. Important to
> spell out a -double- type for the result.
>
> egen double timein = rowmin(los*)
>
> It may be that you then want to apply
>
> ... min(), by(patientid)
>
>
> Nick
> [email protected]
>
>
> On 28 May 2013 15:44, Harrison Alter <[email protected]> wrote:
>> I have a dataset of hospital stay records in which each row is a
>> subject, and many of the columns are time stamps, each varname
>> beginning with "los_", e.g. "los_admfloor" or "los_dcsdu". These are
>> doubles using -clock-.
>>
>> To calculate the absolute length of stay, I want to generate a
>> variable, say, "timein" with the earliest time stamp, and one
>> "timeout" with the last, then subtract "timein" from "timeout".
>>
>> To generate these variables in Stata 11.2 on a Mac, I tried:
>>
>> egen timein = min(los*), by ( patientid)
>>
>> which returns
>>
>> los* invalid name
>>
>> What's the best way to identify the minimum value among the variables
>> beginning with "los"?
>>
>> Thanks fo any advice you can provide.
>>
>> Harrison Alter
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