topic Re: how rolling standard deviation facing two consecutive 0 value restart counting in SAS Programming

how rolling standard deviation facing two consecutive 0 value restart counting

Jennifer925 — Wed, 04 Jan 2017 23:58:54 GMT

Hello all,

The data have is as follows. I expect the result to show the rolling 3years std by treatment, if the treatment facing one 0 value will continuted to count, but if the treatment facing two consecutive 0 value will be restarted to count. Now assuming 2 treatments, could you do me a great favor to get the result as follows? (the numerical1 to 6 just represents 6 different numerical value for rolling 3 years standard deviations). Thanks a lot.

data have;
input treatment year x;
cards;

treatment year x

1 1980 0
1 1981 0
1 1982 0
1 1983 0
1 1984 5
1 1985 7
1 1986 0
1 1987 6
1 1988 2
1 1989 1
2 1982 0
2 1983 0
2 1984 3
2 1985 0
2 1986 0
2 1987 3
2 1988 0
2 1989 1
2 1990 1

;
run;

I hope the result like this:

treatment year x count std3yr

1 1980 0 0 .
1 1981 0 0 .
1 1982 0 0 .
1 1983 0 0 .
1 1984 5 1 .
1 1985 7 2 .
1 1986 0 3 numerical1
1 1987 6 4 numerical2
1 1988 2 5 numerical3
1 1989 1 6 numerical4
2 1982 0 0 .
2 1983 0 0 .
2 1984 3 1 .
2 1985 0 2 .
2 1986 0 0 .
2 1987 3 1 .
2 1988 0 2 .
2 1989 1 3 numerical5
2 1990 1 4 numerical6

Re: how rolling standard deviation facing two consecutive 0 value restart counting

art297 — Thu, 05 Jan 2017 18:18:49 GMT

I think that the following does what you are looking for:

data want (drop=_:);
set have;
by treatment;
_x1=lag1(x);
_x2=lag2(x);
if first.treatment then do;
count=0;
call missing(_x1);
call missing(_x2);
end;
if x gt 0 or (x eq 0 and _x1 gt 0) then count+1;
else count=0;
if count ge 3 then std3yr=sum(_x1, _x2, x)/3;
run;

HTH,

Art, CEO, AnalystFinder.com

Re: how rolling standard deviation facing two consecutive 0 value restart counting

Rick_SAS — Thu, 05 Jan 2017 18:54:30 GMT

std3yr=sum(_x1, _x2, x)/3;

is presumably a typo. I think Art meant

std3yr=std(_x1, _x2, x);

Re: how rolling standard deviation facing two consecutive 0 value restart counting

Jennifer925 — Thu, 05 Jan 2017 19:10:54 GMT

@Rick_SAS

Thank you very much.

Re: how rolling standard deviation facing two consecutive 0 value restart counting

art297 — Thu, 05 Jan 2017 19:18:42 GMT

Rick,

Thanks for correcting my mental typo.

Art, CEO, AnalystFinder.com

p.s. Happy New Year!