GLM interactions

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thishdesilva
Posts: 1
Joined: Fri Jun 17, 2016 1:32 am

GLM interactions

Postby thishdesilva » Fri Jun 17, 2016 1:37 am

Hi,

I have the following data set that I want to get the interaction between genotype (fixed factor) and sample week (fixed factor). But every time I include the interaction onto the model it does not give me an F or p. Can anyone explain me what I am doing wrong?
Genotype, sample week, chemical compound 1 (dependent var)

1.00 1.00 2.37
1.00 2.00 6.31
1.00 3.00 5.65
1.00 4.00 3.34
2.00 1.00 3.28
2.00 2.00 5.08
2.00 3.00 2.39
2.00 4.00 4.27
3.00 1.00 1.85
3.00 2.00 4.63
3.00 3.00 7.38
3.00 4.00 6.41
gtdavies
Posts: 1
Joined: Tue Aug 23, 2016 6:44 am

Re: GLM interactions

Postby gtdavies » Tue Aug 23, 2016 7:07 am

I have just stumbled accross the same problem.

Univariate GLM. One continuous variable. 3 categorical predictors. Works fine if i only run for main effects, but if do full factorial/specify interactions it gives me no results just blanks for F, p, etc.

No idea why.

I'm sure it's me doing something wrong but I can't work out what and the internet is yet to help.

Cheers in advance to those who know how SPSS and numbers work.

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