Run Regression using data in only specific rows

[azy]

Hi,

I am new to the SAS software. Please do help with this relatively easy question.

I want to run a regression using data from only specific rows in my file. My data is arranged by date. See a sample of my file below:

date	aa	gg	kk
1990-01-02	11	21	34
1990-01-04	34	45	56
1990-01-07	86	5	67
1990-01-09	5	78	89
1990-01-11	6	6	87
1990-01-14	6	6	67
1990-01-17	66	6	67
1990-01-22	6	44	51
1990-01-25	35	34	45
1990-01-27	67	86	5

I want to run my regression using data starting from the 4th row (1990-01-07).

[stat_sas]

Hi,

Something like this? I am using a sample data set and you can try on the same pattern on your data set.

data have ;
input var1-var4 ;
n = _n_;
cards;
0.5 1 1.2 0.4
0.9 1 1.5 0.2
0.7 1 1.1 0.3
1 1 1 1
3 1 3 1
4 1 6 7
;
proc reg data=have(where = (n>3));
model var1=var2;
quit;

[Reeza · Accepted solution]

Ideally you would have a rule that is better than after the 4th row, i.e. include all rows where the date is after January 9th, because row numbers aren't included by default which means you need to first create the row numbers. 

You can use a WHERE option after the data set name:

proc reg data=have (where = (date > '09Jan1990'd)) ;

Or you can add a WHERE clause in the PROC REG statement.

proc reg data=have ... ;
WHERE date > '09Jan1990'd;

---

@azy wrote:

Hi,

I am new to the SAS software. Please do help with this relatively easy question.

I want to run a regression using data from only specific rows in my file. My data is arranged by date. See a sample of my file below:

date	aa	gg	kk
1990-01-02	11	21	34
1990-01-04	34	45	56
1990-01-07	86	5	67
1990-01-09	5	78	89
1990-01-11	6	6	87
1990-01-14	6	6	67
1990-01-17	66	6	67
1990-01-22	6	44	51
1990-01-25	35	34	45
1990-01-27	67	86	5

I want to run my regression using data starting from the 4th row (1990-01-07).

---

[azy]

Thank you. This worked pretty well.

[PaigeMiller]

proc reg data=have (firstobs=4) ;

[Reeza]

I stand corrected 😉

[azy]

Thank you, Paige. This worked pretty well too!