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| From | Roberto Ferrer <refp16@gmail.com> |
| To | Stata Help <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: Mark observation if date variable is between some range |
| Date | Wed, 14 Aug 2013 00:19:13 +0100 |
Excellent! Thank you for your replies and Sergiy for the code. Precisely what I was looking for; my initial code was long, confusing and error-prone (apart from incorrect). Bests, Roberto On Tue, Aug 13, 2013 at 11:33 PM, Nick Cox <njcoxstata@gmail.com> wrote: > Sure. I wasn't paying attention to the whole question, just > > Is it not possible to represent day-month as a date in Stata? > Nick > njcoxstata@gmail.com > > > On 13 August 2013 23:30, Sergiy Radyakin <serjradyakin@gmail.com> wrote: >> Nick, the question is how to create a pool of candidates (date) for >> the condition you posted. Suppose the end of the period is 100 years >> from begin. That makes it close to a hundred candidates to probe. >> Fortunately in this case we know that any period longer than a year >> would contain any given day for certain, so we don't need to probe >> anything when endorig-begorig>=366. >> >> The interesting case is to find the candidates within the remaining >> situations. I see two candidates, 30jun in the year of begorig and >> 30jun in the year of endorig. >> >> My solution is here: >> do http://radyakin.org/statalist/2013081301/dateinrange2.do >> >> Roberto should be careful that although this solution seems to work >> fine for June 30, it would NOT work for February 29, for apparent >> reasons. >> >> This is also an example of the nested cond() for the discussion >> started last week >> http://www.stata.com/statalist/archive/2013-08/msg00351.html >> >> Best, Sergiy Radyakin >> >> >> >> On Tue, Aug 13, 2013 at 5:39 PM, Nick Cox <njcoxstata@gmail.com> wrote: >>> Think of your birthday. Does it define a single date? No, it defines a >>> set of dates. >>> >>> Either way, Stata doesn't regard a day-month as a date, but that need >>> not stand in your way. Your condition is just something like >>> >>> ... if month(date) == 12 & day(date) == 25 >>> >>> and you can add extra condition(s) in terms of -year(date)- if you wish. >>> Nick >>> njcoxstata@gmail.com >>> >>> >>> On 13 August 2013 22:33, Roberto Ferrer <refp16@gmail.com> wrote: >>>> Nick and Sergiy, >>>> >>>> Thank you for your replies. >>>> >>>> Indeed, a typo in my first post. >>>> >>>> Is there a way in which I can specify the probe as only day-month (no >>>> year)? In case of an episode that spans two+ years, one appearance >>>> would be enough to set the mark. >>>> >>>> Could one strategy be create a series of probes for each observation >>>> (based on the number of years spanning the episode) and to test them? >>>> In a loop maybe. >>>> >>>> A similar problem I think arises with -tin()- and -twithin()-. Is it >>>> not possible to represent day-month as a date in Stata? I haven't been >>>> able to find an example. >>>> >>>> >>>> >>>> >>>> >>>> On Tue, Aug 13, 2013 at 9:29 PM, Sergiy Radyakin <serjradyakin@gmail.com> wrote: >>>>> Roberto, if your variable is numeric variable formatted as date, you >>>>> should not be seeing "31feb1999" as you show in the output. February >>>>> 31 is an impossible date in any year. >>>>> >>>>> Given that that is just a typo, all you need is >>>>> inrange(candidate,beg,end). Most of the following program generates >>>>> the data (that you already have) before applying inrange(). >>>>> >>>>> do http://radyakin.org/statalist/2013081301/dateinrange.do >>>>> >>>>> +----------------------------------------+ >>>>> | begorig endorig probe marker | >>>>> |----------------------------------------| >>>>> 1. | 01jan1998 31dec1998 14067 1 | >>>>> 2. | 01oct1998 05jul1999 14246 1 | >>>>> 3. | 01jan1999 21feb1999 15041 0 | >>>>> +----------------------------------------+ >>>>> >>>>> The variable probe may of course vary by observation, or may be a constant: >>>>> generate sprobe="30jun1999" >>>>> (instead of the second input statement). >>>>> >>>>> Best, Sergiy >>>>> >>>>> >>>>> >>>>> >>>>> On Tue, Aug 13, 2013 at 4:00 PM, Nick Cox <njcoxstata@gmail.com> wrote: >>>>>> See -help tin()- and -help twithin()- >>>>>> Nick >>>>>> njcoxstata@gmail.com >>>>>> >>>>>> >>>>>> On 13 August 2013 20:54, Roberto Ferrer <refp16@gmail.com> wrote: >>>>>>> I have date variables (type: numeric daily date (int)) that define >>>>>>> the beginning and end of an episode for any observation: >>>>>>> >>>>>>> begorig endorig >>>>>>> 01jan1998 31dec1998 >>>>>>> 01oct1998 05jul1999 >>>>>>> 01jan1999 31feb1999 >>>>>>> >>>>>>> I'd like to mark the observation (with some dummy variable) if say, >>>>>>> the day 30jun is between -begorig- and -endorig-. Note that the years >>>>>>> in any episode are not necessarily the same. >>>>>>> >>>>>>> Below is something I wrote which does not work. I think I found the >>>>>>> mistake but have not yet corrected it. Before doing that, can someone >>>>>>> suggest an alternative way? >>>>>>> >>>>>>> local d 30 >>>>>>> local m 6 >>>>>>> >>>>>>> gen dummy = 0 >>>>>>> >>>>>>> /* >>>>>>> If -begorig- and -endorig- have different years the possibilities are: >>>>>>> ------------------------ >>>>>>> -begorig- and -endorig- >>>>>>> ------------------------ >>>>>>> 1. before and anything --> MARK >>>>>>> 2. after and after --> MARK >>>>>>> 3. after and before --> do nothing >>>>>>> */ >>>>>>> replace dummy = 1 if /// >>>>>>> year(begorig) < year(endorig) & /// >>>>>>> day(begorig) <= `d' & month(begorig) <= `m' /// >>>>>>> | /// >>>>>>> year(begorig) < year(endorig) & /// >>>>>>> day(begorig) >= `d' & month(begorig) >= `m' & /// >>>>>>> day(endorig) >= `d' & month(endorig) >= `m' >>>>>>> >>>>>>> /* >>>>>>> If -begorig- and -endorig- have the same year the possibilities are: >>>>>>> ----------------------- >>>>>>> -begorig- and -endorig- >>>>>>> ----------------------- >>>>>>> 1. before and before --> do nothing >>>>>>> 2. before and after --> MARK >>>>>>> 3. after and after --> do nothing >>>>>>> 4. after and before --> not possible >>>>>>> */ >>>>>>> replace dummy = 1 if year(begorig) == year(endorig) & /// >>>>>>> day(begorig) <= `d' & month(begorig) <= `m' & /// >>>>>>> day(endorig) >= `d' & month(endorig) >= `m' >>>>>>> >>>>>>> >>>>>>> Thank you. >>>>>>> * >>>>>>> * For searches and help try: >>>>>>> * http://www.stata.com/help.cgi?search >>>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>>> * >>>>>> * For searches and help try: >>>>>> * http://www.stata.com/help.cgi?search >>>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>>> * http://www.ats.ucla.edu/stat/stata/ >>>>> * >>>>> * For searches and help try: >>>>> * http://www.stata.com/help.cgi?search >>>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>>> * http://www.ats.ucla.edu/stat/stata/ >>>> * >>>> * For searches and help try: >>>> * http://www.stata.com/help.cgi?search >>>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>>> * http://www.ats.ucla.edu/stat/stata/ >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/