How i need to sum first column with another column across?
i mean this:
data stock;
input Astock Bstock;
cards;
500 250
200 658
300 425
400 125
;
run;
data sum;
set stock;
sum=sum(Astock,Bstock);
run;
How i need to change it ?
Like this?
data stock;
input Astock Bstock;
cards;
500 250
200 658
300 425
400 125
;
run;
data want;
set stock;
lag_Astock = lag1(Astock);
if not missing(lag_Astock) then total = sum(Bstock,lag_Astock);
drop lag_Astock;
run;
Like this?
data stock;
input Astock Bstock;
cards;
500 250
200 658
300 425
400 125
;
run;
data want;
set stock;
lag_Astock = lag1(Astock);
if not missing(lag_Astock) then total = sum(Bstock,lag_Astock);
drop lag_Astock;
run;
One more question :
If i have
And i need to find average of three variables and write to next, but first meaning is missing, so i don't need that;;
data numbers;
input A;
cards;
500
400
300
200
800
200
;
run;
data mean;
set numbers;
first = lag(A);
second=lag2(A);
third=lag3(A);
if _n_ ge 3 then mean= mean(of first,second,third);
final=lag1(mean);
run;
but first of all it find mean of missing value+500+400/3=300
How to change ?
If you want a value to be counted in the denominator (3) then there must be a value in the numerator. which would have to be 0 if I understand what you are attempting if you want to use the MEAN function.
Or
mean = sum(of first,second,third) / 3;
When you start getting to complicated requirements to use values that are not in your data then you will have to provide the values using your business logic.
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