[R] glm help - final predictor variable NA

[matthewjones43]

Hi, I am not a statistician and so I am sure whatever it is I am doing wrong
must be an obvious error for those who are...Basically I can not understand
why I get NA for variable 'CDSTotal' when running a glm? Does anyone have an
idea of why this might be happening?

Call:  glm(formula = cbind(SRAS - 26, 182 - SRAS) ~ Age + Gender + LOC + 
    PC + Stability + CDSTotal, family = binomial, data = Controlgroup)

Coefficients:
(Intercept)          Age       Gender          LOC           PC    Stability  
  -2.575071     0.009148     0.354143     0.018295    -0.011317     0.090759  
   CDSTotal  
         NA  

Degrees of Freedom: 64 Total (i.e. Null);  59 Residual
Null Deviance:	    2015 
Residual Deviance: 1264 	AIC: 1614

Thanks
Matthew



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