topic Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime' in SAS Procedures

How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 04:22:18 GMT

data case2;

input sleeptime lifesatisfaction;

datalines;

7.5 23

8.3 19

9.5 16

8.5 20

6.0 40

8.0 22

7.3 30

7.0 25

8.0 30

6.5 36

7.5 23

8.3 19

9.5 16

8.5 20

6.0 40

8.0 22

7.3 30

7.0 25

8.0 30

6.5 36

7.5 23

8.3 19

9.5 16

8.5 20

6.0 40

8.0 22

7.3 30

7.0 25

8.0 30

6.5 36

;

proc reg data=case2;

model lifesatisfaction = sleeptime / p r;

output out=case2Out residual=resid1;

run;

quit;

proc univariate plot data=case2Out normal;

var resid1;

run;

A researcher hypothesizes that undergraduate students who are satisfied with their lives will sleep less than those who are not satisfied. To test this hypothesis, she selects a sample of undergraduate students and asks them to maintain a “sleep log” (Drowsy, 1977), keeping track of the number of hours they sleep during each 24-hour period. These logs are maintained for two weeks. At the end of the two-week period, each participant completes the Satisfaction with Life Scale (Giggle & Smirk, 1969), a reliable, validated measure of general satisfaction with life.

These are the data the researcher obtained:

Participant	Mean Hours of Sleep	SWL Score
01	7.5	23
02	8.3	19
03	9.5	16
04	8.5	20
05	6.0	40
06	8.0	22
07	7.3	30
08	7.0	25
09	8.0	30
10	6.5	36

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Norman21 — Tue, 29 Mar 2016 04:49:20 GMT

I'm not sure what you are asking about SAS code, but I do have a question.

"A researcher hypothesizes... " implies there was a pre-specified hypothesis, which should include a description of the statistical test to be used. This information would have been required to determine the sample size when designing the study. Can you provide the name of the test?

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 04:56:12 GMT

Please post your question in the body. The subject line is like an email subject line - intended as a brief summary.

You may want to read a regression tutorial - I suggest the UCLA tutorials.

You should modify your MODEL starement.
The format is:

DEPENDENT = INDEPENDENT LIST;

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 04:56:53 GMT

MODEL dependent = independent;

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Ksharp — Tue, 29 Mar 2016 04:57:14 GMT


There are too many ties in table. You need FREQ statement.




data case2;
input sleeptime lifesatisfaction;
datalines;
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
;
run;
proc freq data=case2;
table sleeptime*lifesatisfaction /out=want list;
run;
proc reg data=want;
model lifesatisfaction = sleeptime / p r;
freq count;
output out=case2Out residual=resid1;
run;
quit;

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 04:58:42 GMT

http://www.ats.ucla.edu/stat/sas/webbooks/reg/chapter1/sasreg1.htm

Since this is clearly homework you should really do some research.

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 05:00:39 GMT

Thank you Reeza,

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 05:15:37 GMT

Hi Norman 21,

We were provided with the summary and the table. The heading provided was Linear Regression. We had to use the information provided to answer various questions such as 1) What is the criterion variable; 2) What is the predictor variable, etc. All ther questions were based on Using SAS to conduct simple regression analysis.

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 05:27:00 GMT

Dear K. Sharp,

Once again thank you very much for your assistance, I do appreciate your help!

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 05:51:49 GMT

Hello K Sharp,

Unfortunately the output was not successful. I received an error message which states;

NOTE.: The SAS System stopped processing this step because of errors

199 proc reg data=want;
200 model lifesatisfaction = sleeptime / p r;
201 freq count;
202 output out=case2Out residual=resid1;
203 run;
204 quit;

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 07:40:08 GMT

Pleas include the errors.

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Ksharp — Tue, 29 Mar 2016 08:52:18 GMT

Did you run PROC FREQ firstly to get that WANT table ?

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 16:48:35 GMT

Hi K sharp,

I ran the syntax that you changed and posted, namely,

ata case2;
input sleeptime lifesatisfaction;
datalines;
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
7.5 23
8.3 19
9.5 16
8.5 20
6.0 40
8.0 22
7.3 30
7.0 25
8.0 30
6.5 36
;
run;
proc freq data=case2;
table sleeptime*lifesatisfaction /out=want list;
run;
proc reg data=want;
model lifesatisfaction = sleeptime / p r;
freq count;
output out=case2Out residual=resid1;
run;
quit;

Thanks K Sharp,

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 16:59:44 GMT

You're missing a d at the start of your code (data vs ata) but other than that the code runs perfectly fine for me.

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

jmoseley — Tue, 29 Mar 2016 17:57:38 GMT

Hi Reeza,

The Reason why I am requesting assistance is because I have done extensive reading and research but somehow am missing one small thing that may be hampering my success. I am not expecting anyone to do my homework for me.

Josie

Re: How do I change SAS Linear regression syntax to correct dependent "sleeptime'

Reeza — Tue, 29 Mar 2016 17:59:02 GMT

@jmoseley You've marked the question answered, and a similar previous one...are you still having issues with it? If so, please clearly explain your issue, rather than post the assignment. If you put it in your own words it will help all around.