Hi Sum,

See http://home.hccnet.nl/jim.groeneveld/StatText/RunStats.rtf

Regards - Jim. -- Jim Groeneveld, Netherlands Statistician, SAS consultant home.hccnet.nl/jim.groeneveld

On Tue, 7 Nov 2006 20:31:49 -0800, SUM <sumanta24@GMAIL.COM> wrote:

>Hi Arthur, > >Thanks for suggestion. My problem is to calculate sd and mean on a >rolling basis with 12 month window starting from 199001. > >Sumanta. > >Arthur Tabachneck wrote: >> Sumanta, >> >> Why use a loop? If Month is already a date, get year using year(Month). >> >> Then, use proc means, and use year as a class or by variable. >> >> HTH, >> Art >> ------- >> On Tue, 7 Nov 2006 18:23:14 -0800, SUM <sumanta24@GMAIL.COM> wrote: >> >> >Hi SAS Experts, >> > I have a problem of calculation in loops. >> >Suppose i have a data like this: >> > >> > >> > >> >Month Obs >> >199001 40 >> >199002 45 >> >199003 22 >> >.. >> > >> > >> >199012 25 >> >. >> >. >> >. >> > >> > >> >200605 42 >> > >> >Now i have to calculation mean and standard deviation using each 12 >> >months data. First calculation will be done for 199001 - 199012, >> >second will be 199002 - 199101, third will be 199003 - 199102, and so >> >on. How can i proceed using a loop? Please help. >> > >> >Sumanta.