Pick up the date

[umesh1]

Hi

I have the below data set and I would like to pick up the mth_end_dt when SOR from 1 to any number.

data test;

informat MTH_END_DT date9.;

input CLNT_NO MTH_END_DT SOR;

format MTH_END_DT date9.;

cards;

1 31-Mar-14 1

1 30-Apr-14 1

1 31-May-14 2

1 30-Jun-14 2

1 31-Jul-14 3

1 31-Aug-14 3

1 30-Sep-14 3

1 31-Oct-14 3

1 30-Nov-14 1

1 31-Dec-14 3

1 31-Jan-15 3

1 28-Feb-15 6

;

run;

Help me

Thanks

[mohamed_zaki]

Can you explian better what you want to do? Could you give example of your desired output?

[umesh1]

Like in the in the row number 3 I need the date because previous SOR is 1. In the 10th row I need date because previous SOR is 1

[mohamed_zaki · Accepted solution]

maybe this what you want

data want ;
set test;
prev=lag(sor);
if prev=1 and sor ~=1;
drop prev;
run;

[FreelanceReinh]

Hi @umesh1,

If your real data contain more than one client, you may want to amend the IF condition in @mohamed_zaki's data step as shown below. Otherwise the first observation of a client might be selected because the previous client's last observation had SOR=1. 

if prev=1 and sor ~=1 and clnt_no=lag(clnt_no);

However, this modification would be redundant if the first observation of each client had SOR=1.