Hi,
I have a follow analysis
Trat1 = quantitative variable
Trat2 = qualitative variable with 3 levels (A, B, C)
Trat3 = qualitative variable with 3 levels (D, E, F)
Resp = Response
I try to get the parameters to compare with zero, so I make this model:
glm(Resp~Trat1*Trat2+Trat1*Trat3-Trat1-1)
The -Trat1 is to make comparison of slope with zero.
The -1 is to make comparison os intercept with zero.
The results that I want are:
Coefficients:
Estimate Std. Error t value Pr(>|t|)
Trat2A
Trat2B
Trat2C
Trat3D
Trat3E
Trat3F
Trat1:Trat2A
Trat1:Trat2B
Trat1:Trat2C
Trat1:Trat3D
Trat1:Trat3E
Trat1:Trat3F
But I get this:
Coefficients:
Estimate Std. Error t value Pr(>|t|)
Trat2A 1.35333 1.00307 1.349 0.18108
Trat2B 1.35333 1.00307 1.349 0.18108
Trat2C 4.29333 1.00307 4.280 5.14e-05 ***
Trat3E 0.86667 1.09881 0.789 0.43260
Trat3F 0.92000 1.09881 0.837 0.40493
Trat1:Trat2A 0.53657 0.16166 3.319 0.00136 **
Trat1:Trat2B 0.53657 0.16166 3.319 0.00136 **
Trat1:Trat2C -0.09313 0.16166 -0.576 0.56617
Trat1:Trat3E 0.03636 0.17709 0.205 0.83783
Trat1:Trat3F 0.34000 0.17709 1.920 0.05843 .
Look that the intercept and slope of Trat3D dont appear
What is the problem?
Thanks
Ronaldo
--
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