Proc glm

Dylans15 — Tue, 14 Aug 2018 15:19:48 GMT

Hello,

I am conducting an ANOVA using proc glm and was wondering about confidence interval.

I do not mention CI in my code. Does that mean that it assumes 95%, or is another statement needed?

proc glm data=sasdata.ptsd;
class PTSD;
model auditscore=PTSD;
means PTSD;
run;
quit;

Thanks

Re: Proc glm

Reeza — Tue, 14 Aug 2018 15:29:59 GMT

The default alpha is 5% so 95% confidence intervals.

You can modify the defaults.

Be careful with default settings, they do things you don't expect sometimes, a CLASS statement being the most problematic usually. For example, check your design matrix and ensure the coding is what you wanted.

model auditscore=PTSD / alpha=0.05;

proc glm data=sasdata.ptsd alpha=0.05;

From the docs:

https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_glm_syntax01.htm&docsetVersion=14.3&locale=en#statug.glm.gprc_opt_a

ALPHA=p

specifies the level of significance p for % confidence intervals. The value must be between 0 and 1; the default value of p = 0.05 results in 95% intervals. This value is used as the default confidence level for limits computed by the following options.

Statement	Options
LSMEANS	CL
MEANS	CLM CLDIFF
MODEL	CLI CLM CLPARM
OUTPUT	UCL= LCL= UCLM= LCLM=

@Dylans15 wrote:

Hello,

I am conducting an ANOVA using proc glm and was wondering about confidence interval.

I do not mention CI in my code. Does that mean that it assumes 95%, or is another statement needed?

proc glm data=sasdata.ptsd;
class PTSD;
model auditscore=PTSD;
means PTSD;
run;
quit;

Thanks

Re: Proc glm

Dylans15 — Tue, 14 Aug 2018 15:36:24 GMT

Thank you!

topic Re: Proc glm in Statistical Procedures

Proc glm

Re: Proc glm

Re: Proc glm