topic Re: Run Regression using data in only specific rows in SAS Programming

Run Regression using data in only specific rows

azy — Sat, 03 Feb 2018 18:22:55 GMT

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).

Re: Run Regression using data in only specific rows

stat_sas — Sat, 03 Feb 2018 18:57:54 GMT

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;

Re: Run Regression using data in only specific rows

Reeza — Sat, 03 Feb 2018 20:38:20 GMT

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).

Re: Run Regression using data in only specific rows

PaigeMiller — Sat, 03 Feb 2018 22:38:56 GMT

proc reg data=have (firstobs=4) ;

Re: Run Regression using data in only specific rows

Reeza — Sun, 04 Feb 2018 01:08:20 GMT

I stand corrected 😉

Re: Run Regression using data in only specific rows

azy — Sun, 04 Feb 2018 15:26:45 GMT

Thank you. This worked pretty well.

Re: Run Regression using data in only specific rows

azy — Sun, 04 Feb 2018 15:27:26 GMT

Thank you, Paige. This worked pretty well too!