Row by row comparison same group

[Sk1_SAS]

Hello Team,

I need verify if the numbers of rows are increased in months. 

This is my table:

DATA want;
 INPUT TABLE_NAME $ MONTH NOBS GRUP;
CARDS;
TABLE_A 202101 1234 1
TABLE_A 202102 1235 1
TABLE_A 202103 1236 1
TABLE_A 202104 1237 1
TABLE_A 202105 1238 1
TABLE_A 202106 1239 1
TABLE_A 202107 1230 1
TABLE_B 202101 1000 2
TABLE_B 202102 500 2
TABLE_B 202103 700 2
TABLE_B 202104 300 2
;
RUN;

i need compare the nobs of the first month with next moth

Ex: Compare nobs in Grup 1 - > 202101 with 202102, 202102 with 202103, 202103 with 202104.....

and if the month is less than the next month, status = 'true' else 'false', the first month of the grup can start with "TRUE"

What i need:

Thanks!!

[Reeza · Accepted solution]

Look at the DIF function for starters.

data want;
set have;
by table_name;
dif = dif(NOBS);
if first.table_name or dif>0 then status="TRUE";
else status="FALSE";
run;

[Sk1_SAS]

Thank you!

How can i start with "TRUE" for the first month of the ids? i can not compare the first one.

[Reeza]

If first.table_name will take care of that. I made a mistake and typed out first.month in my first version of the code, updated it for you here.