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JOLSAS
Quartz | Level 8

Hi all,

 

I have such a proc glm test:

 

proc glm data=dataset1;
     class f1 f2 f3 ;
     model car = a b a*b f1 f2 f3 / solution;

run; quit;

 

Normally I would get individual t value and p value for each of the independent variables. But I also want to test this:

 

b1+b3=0.

b1 being the coefficient for variable a, and b3 being the coefficient for a*b

 

I've been doing some googling, and it seems that I need to use estimate or contrast statement? I didn't get the help I needed from googling. Anyone please help? Appreciate it!

1 ACCEPTED SOLUTION

Accepted Solutions
JOLSAS
Quartz | Level 8

Hi PG,

 

Thanks for replying! But I have one question though.

 

Does "a 1 a*b -1" mean that I'm testing the hypothesis " b1-b3 = 0"?

 

Since I want to test if b1+b3=0, do I want to do the following:

 

estimate 'test' a 1 a*b 1?

 

Thanks!

View solution in original post

4 REPLIES 4
PGStats
Opal | Level 21

Add the statement

 

estimate 'test' a 1 a*b -1;

PG
JOLSAS
Quartz | Level 8

Hi PG,

 

Thanks for replying! But I have one question though.

 

Does "a 1 a*b -1" mean that I'm testing the hypothesis " b1-b3 = 0"?

 

Since I want to test if b1+b3=0, do I want to do the following:

 

estimate 'test' a 1 a*b 1?

 

Thanks!

PGStats
Opal | Level 21

Sorry, my error, you are right.

PG
JOLSAS
Quartz | Level 8

Thanks a lot!

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