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Is this what you are trying to do:
DATA X;
LENGTH ID DAY TEMP 3.;
INPUT ID DAY TEMP ;
DATALINES;
1 1 100
1 2 101
1 3 99
1 4 101
;
RUN;
PROC SORT DATA=X;BY ID;RUN;
DATA X;
SET X;
BY ID;
RETAIN TEMPP;
IF FIRST.ID THEN TEMPP=TEMP;
DIFF=ABS(TEMPP-TEMP);
RUN;
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