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Engel
Calcite | Level 5

Dear SAS experts, In my data set (animal behavior) I would like to create a new variable:  the time interval between two events. There exists the variables 'first (starting time of  behavior)’ and 'Last (ending time of behavior)' per line (see attached table). I am interested in the time interval between 'last' in line n and 'first' in line n + 1. I really appreciate your help 🙂

1 ACCEPTED SOLUTION

Accepted Solutions
art297
Opal | Level 21

Can't you just use the lag function?  e.g.:

libname art "c:\art";

data want;

  format difference time8.;

  set art.inter;

  by datum name;

  last_last=lag(last);

  if first.name then call missing(last_last);

  difference=first-last_last;

run;

View solution in original post

5 REPLIES 5
art297
Opal | Level 21

Can't you just use the lag function?  e.g.:

libname art "c:\art";

data want;

  format difference time8.;

  set art.inter;

  by datum name;

  last_last=lag(last);

  if first.name then call missing(last_last);

  difference=first-last_last;

run;

Haikuo
Onyx | Level 15

Echo with Art, you can also use dif(); sorry, Art, for stealing your code:

data want;

  format difference time8.;

  set art.inter;

  by datum name;

/*  last_last=lag(last);

  if first.name then call missing(last_last);*/

  difference=ifn(first.name,.,dif(last));

run;

Haikuo

art297
Opal | Level 21

: I don't mind your "stealing" the code, but your solution doesn't meet the OP's requirements.  You are taking the difference between last and the previous last.  The OP wanted the difference between the current first and the previous last.

Haikuo
Onyx | Level 15

Oops, my bad. Now I know why you choose to use lag(). Haikuo

Engel
Calcite | Level 5

Dear Arthur, thank you very much! It is exactly what I wanted. Best regards from Germany Engel

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