I have table-A with following columns:
Year | WeekNo | SalesRepID | Region | Amount |
---|---|---|---|---|
2012 | 1 | 001 | 1 | $100 |
2012 | 1 | 002 | 1 | $200 |
2012 | 1 | 003 | 1 | $300 |
2012 | 2 | 001 | 1 | $400 |
2012 | 2 | 003 | 1 | $500 |
Then I created new dataset to add "Last Week Amount"
Data Work.test;
Set work.tableA;
by Year, WeekNo, SalesRepID, Region;
LastWeekAmount = lag(Amount);
run;
Year | WeekNo | SalesRepID | Region | Amount | LastWeekAmount |
---|---|---|---|---|---|
2012 | 1 | 001 | 1 | $100 | $0 |
2012 | 1 | 002 | 1 | $200 | $0 |
2012 | 1 | 003 | 1 | $300 | $0 |
2012 | 2 | 001 | 1 | $400 | $100 |
2012 | 2 | 003 | 1 | $500 | $300 |
Next, when i query the previous table for Year, WeekNo, Region, Amount and LastWeekAmount - the value of "LastWeekAmount" does not show the correct value.
Select Year, WeekNo, Region, sum(Amount), sum(LastWeekAmount)
From work.test
Group by Year, WeekNo, Region
Results:
Year | WeekNo | Region | Amount | LastWeekAmount |
---|---|---|---|---|
2012 | 1 | 1 | $600 | $0 |
2012 | 2 | 2 | $900 | $400 (this value shold be $600) |
Last week amount for weekNo2 shows $400 because i'm missing the SalesRepID "003" for weekno2.
How can i sum the last week amount to show the value of $600 for weekno.2 ?
Thanks
data temp;
input Year WeekNo SalesRepID Region Amount;
cards;
2012 1 001 1 100
2012 1 002 1 200
2012 1 003 1 300
2012 2 001 1 400
2012 2 003 1 500
;run;
proc print; run;
data temp1;
set temp;
LastWeekAmount = lag(Amount);
LastWeekAmount1 = lag(LastWeekAmount);
run;
proc print; run;
proc sql;
select sum(LastWeekAmount1) from temp1;
quit;
Output for temp1:
Last Last
Week Sales Week Week
Obs Year No RepID Region Amount Amount Amount1
1 2012 1 1 1 100 . .
2 2012 1 2 1 200 100 .
3 2012 1 3 1 300 200 100
4 2012 2 1 1 400 300 200
5 2012 2 3 1 500 400 300
Sum:
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600
There you go:
data have;
input year WeekNo SalesRepID :$3. Region Amount dollar8.;
cards;
2012 1 001 1 $100
2012 1 002 1 $200
2012 1 003 1 $300
2012 2 001 1 $400
2012 2 003 1 $500
;
data want (keep=year WeekNo Region LastWeekAmount total rename=total=amount);
LastWeekAmount=total;
total=0;
do until (last.weekno);
set have;
by year weekno;
total+amount;
end;
output;
run;
proc print;run;
Your example table showing LastWeekAmount does not match your program. Your program is just using the value from the previous observation whether it is for another week or salesrep.
Why not just summarize by week and THEN apply the LAG() function?
Not quit understand what you mean. But Hash Table looks good.
Ksharp
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