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Re: st: Duration data- count number of spells with ref to current spell
From
Roberto Ferrer <[email protected]>
To
Stata Help <[email protected]>
Subject
Re: st: Duration data- count number of spells with ref to current spell
Date
Mon, 26 Aug 2013 23:43:56 +0100
This works with your example. Add -by- when generalizing to multiple
person case.
* ------------------------------ input---------------------------------
clear
input person eventStart str20 eventType
1 10 work
1 14 lunch
1 15 work
1 16 work
1 33 shopping
1 34 shopping
end
*-------------------- what you want---------------------------------
gen dum =1 if eventType == "work"
gen before = sum(dum) -1
replace before = before + 1 if dum == .
egen tot = max(before)
gen after = tot - before - 1
replace after = after + 1 if dum == .
*---------------------clean up-----------------------------
drop dum tot
list
On Mon, Aug 26, 2013 at 10:01 PM, Sriram Narayanamoorthy
<[email protected]> wrote:
> Hi Nick,
>
> Thanks for the response. Though, I am not quite sure I understand the
> solution. Is the variable "activity" in your toy dataset is the
> eventType I referred to in my question or is it something else. I
> think your approach would give me the net time spend in other
> activities before current activity (or time remaining to spend). What
> I want to do is count the number of activity of a particular type.
>
> I have provided an example below:
>
> person eventStart eventType
> 1 10 work
> 1 14 lunch
> 1 15 work
> 1 16 work
> 1 33 shopping
> 1 34 shopping
>
>
> The dataset is sorted in person and eventStart. Say, I want to count
> the number of "work" events before and after the current event - based
> on the eventStart variable. This would be my output. For, example for
> the lunch tour, I have 1 work tours before time period 14 and 2 work
> tours after time period 14.
>
> person eventStart eventType numWorkBefore
> numWorkAfter
> 1 10 work 0
> 2
> 1 14 lunch 1
> 2
> 1 15 work 1
> 1
> 1 16 work 2
> 0
> 1 33 shopping 3
> 0
> 1 34 shopping 3
> 0
>
> Please let me know if I am misunderstanding your solution.
>
> Thanks,
> -Sriram
> *
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*
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