Thanks Nick, what I meant more broadly was whether multiple date
variables, all whose names begin with "t_", for example t_date1,
t_date2, etc., could be specified in this line, in which the second
date is changed for a wider time frame:
> foreach var of varlist `r(varlist)'{
> gen byte seek`var' = `var' > td(1nov2009) & t_date < td(9nov2009)
I also attempted a modification, which rather than giving me the id of
only records in which any date (t_*) was within 1nov to 9nov, instead
gave me all records and all dates:
qui ds t_*
sort id
foreach var of varlist `r(varlist)'{
gen byte seek`var' = `var' > td(1nov2009) & `var' < td(9nov2009)
list id seek* if `var'!=0
}
On Oct 9, 2009, at 9:37 AM, Nick Cox wrote:
> If these are daily data, being later than 1 nov 2009 and earlier
> than 3
> nov 2009 (which the code clearly implies) reduces to being equal to 2
> nov 2009, so you just need a single equality.
>
> In addition, check out -tin()- and -twithin()- which can lead to
> simpler
> code.
>
> Nick
> [email protected]
>
> Martin Weiss
>
> You may also find -help time_series_functions- useful...
>
> *************
> clear
> set obs 5
> gen id = _n
> gen date="11012009"
> replace date="11022009" in 3
> replace date="11032009" in 4
> list date
> generate t_date = date(date, "MDY")
> generate t_anotherdate=t_date+2
> format t_* %td
>
> qui ds t_*
>
> foreach var of varlist `r(varlist)'{
> gen byte seek`var' = `var' > td(1nov2009) & t_date <
> td(3nov2009)
> }
>
> list, noobs
>
> *************
>
> Michael McCulloch
>
> I'm looking for events that all occurred within a specified date
> range, searching in multiple date fields. I've created the following
> example to show that I want to find all records where t_date is
> between 1nov2009 and 3nov2009.
>
> This works fine, but is there a way to create a loop that would do
> this search within multiple date fields, all of which have field name
> beginning with "t_"?
>
> clear
> set obs 5
> gen id = _n
> gen date="11012009"
> replace date="11022009" in 3
> replace date="11032009" in 4
> list date
> generate t_date = date(date, "MDY")
> format t_date %td
> gen seek = cond((t_date > td(1nov2009) & t_date < td(3nov2009)), 1, 0)
> sort seek
> list id t_date seek if seek==1
> list id t_date if (t_date > d(1nov2009) & t_date < d(3nov2009))
>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
Michael McCulloch, LAc MPH PhD
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel: 415-407-1357
fax: 206-338-2391
[email protected]
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
