obs_sno

[BrahmanandaRao]

Obs_Sno	Name	Sex	Age	Height	Weight
15	Philip	M	16	72	150
16	Robert	M	12	64.8	128
17	Ronald	M	15	67	133
18	Thomas	M	11	57.5	85
19	William	M	15	66.5	112

data one ; do obs_sno=1 to nobs; set sashelp.class nobs=nobs; if _n_>=nobs-4 ; output; end; run;

 REQUIRED OUTPUT

Obs_Sno	Name	Sex	Age	Height	Weight
15	Philip	M	16	72	150
16	Robert	M	12	64.8	128
17	Ronald	M	15	67	133
18	Thomas	M	11	57.5	85
19	William	M	15	66.5	112

[Kurt_Bremser]

And what is your question?

---

@BrahmanandaRao wrote:

Obs_Sno	Name	Sex	Age	Height	Weight
15	Philip	M	16	72	150
16	Robert	M	12	64.8	128
17	Ronald	M	15	67	133
18	Thomas	M	11	57.5	85
19	William	M	15	66.5	112

data one ; do obs_sno=1 to nobs; set sashelp.class nobs=nobs; if _n_>=nobs-4 ; output; end; run;

 REQUIRED OUTPUT

Obs_Sno	Name	Sex	Age	Height	Weight
15	Philip	M	16	72	150
16	Robert	M	12	64.8	128
17	Ronald	M	15	67	133
18	Thomas	M	11	57.5	85
19	William	M	15	66.5	112

---

[BrahmanandaRao]

i want  below  required output

Obs_Sno Name Sex Age Height Weight
15 Philip M 16 72 150
16 Robert M 12 64.8 128
17 Ronald M 15 67 133
18 Thomas M 11 57.5 85
19 William M 15 66.5 112

[ballardw · Accepted solution]

data want;
   set sashelp.class nobs=totalobs;
   obs_no = _n_;
   if _n_ ge totalobs - 4;
run;

You have to use the NOBS= option on the Set statement to create a variable that holds the number of observations in the input data set. Then you also have to explicitly assign the _n_ value to another variable to keep the observations number if you want that value.