Is there a way to reset Lag fields to 0? I have the following code and want to reset the values in x1-11 when I move to a new by group based on level 1 and level 2. I tried resetting in a do loop but that is not working.....thanks for the help!
DATA ADD_LAGS;
SET WORK.SUMMARY_RET_DATA;
BY level1 level2 YYYYMM SUM_OF_BILLINGS;
*retain x1-x11 Rolling_12;
if first.level1 then do;
x1=0;
x2=0;
x3=0;
x4=0;
x5=0;
x6=0;
x7=0;
x8=0;
x9=0;
x10=0;
x11=0;
end;
x1 =lag1(sum_of_Billings);
x2 =lag2(sum_of_Billings);
x3 =lag3(sum_of_Billings);
x4 =lag4(sum_of_Billings);
x5 =lag5(sum_of_Billings);
x6 =lag6(sum_of_Billings);
x7 =lag7(sum_of_Billings);
x8 =lag8(sum_of_Billings);
x9 =lag9(sum_of_Billings);
x10=lag10(sum_of_Billings);
x11=lag11(sum_of_Billings);
If _N_ = 1 then Rolling_12 = sum_of_Billings;
Else if _N_ < 12 then Rolling_12 + sum_of_Billings;
Else Rolling_12 = sum(sum_of_Billings,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11);
run;
You could first calculate the lagged values then reset the ones that don't apply.
DATA ADD_LAGS;
SET WORK.SUMMARY_RET_DATA;
BY level1 level2 YYYYMM SUM_OF_BILLINGS;
x1 =lag1(sum_of_Billings);
x2 =lag2(sum_of_Billings);
x3 =lag3(sum_of_Billings);
x4 =lag4(sum_of_Billings);
x5 =lag5(sum_of_Billings);
x6 =lag6(sum_of_Billings);
x7 =lag7(sum_of_Billings);
x8 =lag8(sum_of_Billings);
x9 =lag9(sum_of_Billings);
x10=lag10(sum_of_Billings);
x11=lag11(sum_of_Billings);
array x x1-x11 ;
n+1;
if first.level1 then n=1;
do i=n to dim(x) ;
x(i)=0;
end;
...
You could first calculate the lagged values then reset the ones that don't apply.
DATA ADD_LAGS;
SET WORK.SUMMARY_RET_DATA;
BY level1 level2 YYYYMM SUM_OF_BILLINGS;
x1 =lag1(sum_of_Billings);
x2 =lag2(sum_of_Billings);
x3 =lag3(sum_of_Billings);
x4 =lag4(sum_of_Billings);
x5 =lag5(sum_of_Billings);
x6 =lag6(sum_of_Billings);
x7 =lag7(sum_of_Billings);
x8 =lag8(sum_of_Billings);
x9 =lag9(sum_of_Billings);
x10=lag10(sum_of_Billings);
x11=lag11(sum_of_Billings);
array x x1-x11 ;
n+1;
if first.level1 then n=1;
do i=n to dim(x) ;
x(i)=0;
end;
...
Follow @Tom's suggestion.
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