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[英]Update first row with oldest, the next with second oldest, and so forth
[英]How to subtract second row from first, fourth row from third and so forth
我有 SAS 數據集,如所附圖片中所示。
到目前為止我嘗試過的是
DATA WANT2;
SET WANT;
BY APPT_TYPE;
IF FIRST.APPT_TYPE THEN SUPPLY-OPEN; ELSE 'ERROR';
RUN;
這會引發錯誤,因為語句無效..
不太確定如何解決這個問題
干得好。 我能用你提供的有限信息做到最好。 下次請提供示例數據和您的預期輸出。
data have;
input APPT_TYPE$ _NAME_$ Quantity;
datalines;
ASON Supply 10
ASON Open 8
ASSN Supply 9
ASSN Open 7
S30 Supply 11
S30 Open 8
;
proc sort data = have;
by APPT_TYPE descending _NAME_ ;
run;
data want;
set have;
by APPT_TYPE descending _NAME_;
lag_N_Order = lag1(Quantity);
N_Order = Quantity;
Difference = lag_N_Order - N_Order;
keep APPT_TYPE _NAME_ N_Order lag_N_Order Difference Type;
if last.APPT_TYPE & last._NAME_ & Difference>0;
run;
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