[R] choose the intercept from glm and lm

Knut Krueger rh at family-krueger.com
Tue Jan 8 20:48:32 CET 2008

Hi to all,
Is there a possibility to choose which value is used for the intercept 
or does in not make any sense?
f.e I would like to use outcome2 for the intercept

## Dobson (1990) Page 93: Randomized Controlled Trial :
counts <- c(18,17,15,20,10,20,25,13,12)
outcome <- gl(3,1,9)
treatment <- gl(3,3)
print(d.AD <- data.frame(treatment, outcome, counts))
glm.D93 <- glm(counts ~ outcome + treatment, family=poisson())

              Estimate Std. Error  z value Pr(>|z|)    
(Intercept)  3.045e+00  1.709e-01   17.815   <2e-16 ***
outcome2    -4.543e-01  2.022e-01   -2.247   0.0246 *  
outcome3    -2.930e-01  1.927e-01   -1.520   0.1285    
treatment2   8.717e-16  2.000e-01 4.36e-15   1.0000    
treatment3   4.557e-16  2.000e-01 2.28e-15   1.0000

Regards Knut

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