Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| From | Nick Cox <njcoxstata@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: string date |
| Date | Thu, 2 Feb 2012 09:50:48 +0000 |
An alternative to quarter(dofq(yourvar)) is 1959 + ceil(yourvar/4). This follows directly from the rule that quarters run 1 ... 4 in each calendar year and Stata's rule that the first date of any kind in 1960 is numbered 1. So in 1960 quarterly dates run 1..4 which round up to 1 when divided by 4 and in 2012 quarterly dates run 208 ... 212 which round up to 53 when divided by 4. On Wed, Feb 1, 2012 at 11:39 PM, Nick Cox <njcoxstata@gmail.com> wrote: > There is some ambiguity here. > > If -yourvar- is a numeric variable with such a format assigned then > the year is yofd(dofq(yourvar)) and it is itself a quarterly date. The > quarter of year which runs 1...4 is quarter(dofq(yourvar)) or > mod(yourvar, 4) + 1. > > If -yourvar- is string, then year is real(substr(yourvar,1,4)) and > the quarter of the year is real(substr(yourvar, -1, 1)). > > To solve these problems, you just have to read the help to find the > right functions. Nothing is esoteric or hidden; equally there are so > many possibilities that it can easily take a few minutes to find the > solution. On Wed, Feb 1, 2012 at 11:20 PM, Rui Zeng <rzeng@wisc.edu> wrote: >> How can I extract year and quarter from a string format date suhc as >> "1987q1"? I can not use the format command to transfer from string to %tq >> format. thanks! * * 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/