Answer / rajaanku11

The Above can be done in a single data step as
follows.Actually this is suggestable.


data _null_;
set abc;
retain z;
if tdate='18APR2008'D then
z=avg;
if tdate='21APR2008'D then
do;
diff=Z-avg;
put 'the difference=' diff;
stop;
end;
run;

Answer / nagesh sriram

Hi,
I am think that the difference between the first and last
records value?

data _null_;
set abc end=last;
retain first;
if _n_=1 then first=avg;
if last=1 then do;
diff=first - avg;
put 'The difference is =' diff;
stop;
end;
run;

here _n_=1 is hold the first record in the abc dataset.
Last=1 means is hold the last record in the dataset.

Answer / kumaraswamy maduri

If you want only for the above specified dates then answer
3 works and if it is for first and last observations in the
dataset then answer 4 works.

Answer / rohitbedi

Shortest answer: Copy the dataset and create a new field using difn function on avg where n=3 as shown below.

data abc2;
set abc;
diff = dif3(avg);
run;

Answer / rajaanku11

Hi, pls modify slight changes to the above prog.

data _null_ ;
set abc;
if tdate='18APR2008'D then
call symput('x',avg);
if tdate='21APR2008'D then
call symput('y',avg);
run;
%put _user_;
data _null_;
z=&x-&y;
put 'the difference=' z;
run;

Answer / chandu

We can solve this with array......

Answer / abhilash

Use symgetfunction to resolve a macro variable with in same
data step while creating macro variable using call symput.


DATA test;
SET ABC;
IF TDATE='18APR2008'D THEN
CALL SYMPUT('A2',AVG);
ELSE IF TDATE='21APR2008'D THEN
CALL SYMPUT('B2',AVG);
diff = symget('a2') - symget('b2');
RUN;

Answer / rajaanku11

DATA ABC;
INPUT TDATE DATE9. AVG;
CARDS;
18APR2008 150.00
19APR2008 167.00
20APR2008 123.00
21APR2008 145.00
;
RUN;

data _null_;
set abc;
if tdate='18APR2008'D then
call symput('x',avg);
if tdate='21APR2008'D then
call symput('y',avg);
z=&x-&y;
run;

data _null_;
z=&x-&y;
put 'the difference='z;
run;

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