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From | "Nick Cox" <n.j.cox@durham.ac.uk> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | RE: st: RE: How to define shortest possible period with 95% of observations |
Date | Tue, 11 May 2010 15:23:09 +0100 |
This isn't the question. For a start, -sumnmarize, detail- only reports certain percentiles. Even if it did report all possible percentiles (order statistics), the problem still remains: which of various intervals that contain at least 95% of the observations is the shortest? That is, which of the differences 95% percentile - 0% percentile (95 + a bit)% - (0 + a bit)% percentile 100% percentile - 5% percentile is the shortest? Nick n.j.cox@durham.ac.uk Dan Waldo I should have said summarize date [fweight=fires] if year==`t' , detail shouldn't I. Sorry. --- On Tue, 5/11/10, Dan Waldo <dan_waldo@yahoo.com> wrote: > I may have grievously oversimplified > the issue raised, but is it possible that the summarize > command would work? That is, to use the 5th and 95th > percentiles from > > .summarize date if fires>0 & year==1983, detail > > This could be turned into a forvalues loop if there are > many years: > forval t=1978/1993 { > summarize date if fires>0 , detail > } > > > Daniel Mueller > > > > I have a strongly unbalanced panel with 100,000 > observations > > (=fire occurrences per day) that contain between none > (no fire) > > and 3,000 fires per day for 8 years. The fire events > peak in > > March and April with about 85-90% of the yearly > total. > > > > My question is how I can define the shortest possible > > continuous period of days for each year that contains > 95% > > of all yearly fires. The length and width of the > periods may > > slightly differ across the years due to > > climate and other parameters. > > > > I am sure there is a neat trick in Stata for this, yet > I have not > > spotted it. Any suggestions would be appreciated. * * 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/