topic Calculations with multiple observations in SAS Programming

Calculations with multiple observations

Coa_SAs — Tue, 22 Dec 2015 17:35:48 GMT

Hi All,

I have data like below

Date B C D E

20141231 193.83 93.04 129.98 96.15
20150102 194.41 93.02 129.95 95.03
20150105 188.34 90.56 129.05 93.5
20150106 184.53 88.63 127.53 92.95
20150107 187.28 90.3 129.51 94.87
20150108 190.27 91.58 131.8 97.06
20150109 187.35 90.42 131.54 95.99
20150112 185.07 89.5 30.87 95.86
20150113 184.93 89.23 131.17 95.01

I need to calcute Score = B1*B2+C1*C2+D1*D2+E1*E2

How to perform this calculation in SAS, Please advise

Re: Calculations with multiple observations

Reeza — Tue, 22 Dec 2015 17:50:04 GMT

Your formula is correct and will work directly in SAS, by adding a semi colon.

What issue are you having?

Score = B1*B2+C1*C2+D1*D2+E1*E2;

Re: Calculations with multiple observations

Coa_SAs — Tue, 22 Dec 2015 18:00:27 GMT

Reeza,

I need to multiply first obervation with second and second with third and thrid with fourth.etc.and summing all the reult.

Re: Calculations with multiple observations

Reeza — Tue, 22 Dec 2015 18:03:16 GMT

Post the expected output from the data above. Are you looking forward or looking back - does it matter? Looking back is easier, you can use the lag function.

score=B*lag1(b)+c*lag(c) + d1*lag(d) +e*lag1(e);

Re: Calculations with multiple observations

Jagadishkatam — Wed, 23 Dec 2015 02:01:12 GMT

Try to get the next record adjacent to the current record and then use the formula.

data have;
input Date          B1            C1        D1          E1;
cards;
20141231 193.83  93.04  129.98  96.15
20150102 194.41  93.02  129.95  95.03
20150105 188.34  90.56  129.05  93.5
20150106 184.53  88.63  127.53  92.95
20150107 187.28  90.3    129.51  94.87
20150108 190.27  91.58  131.8   97.06
20150109 187.35  90.42  131.54  95.99
20150112 185.07  89.5    30.87    95.86
20150113 184.93  89.23  131.17  95.01
;

data want;
obss=_n_+1;
set have end=last; if obss<=nobs then set have(keep=b1 c1 d1 e1 rename=(b1=b2 c1=c2 d1=d2 e1=e2)) end=last nobs=nobs point=obss;
if not last then score=sum(B1*B2,C1*C2,D1*D2,E1*E2);
else do;
score=.;
call missing(b2,c2,d2,e2) ;
end;
run;

Re: Calculations with multiple observations

Coa_SAs — Wed, 23 Dec 2015 16:27:45 GMT

Thanks Reeza and Jagadishkatam, Its working now. Hooray!