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What does it mean X.Intercept equal to NA as a result of glm summary ? Thanks.

Coefficients: (1 not defined because of singularities)

            Estimate Std. Error z value Pr(>|z|)

(Intercept) 1.98e+02 4.72e+01 4.18 2.9e-05 ***

X.Intercept. NA NA NA NA

GiorgioG
  • 111

1 Answers1

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My mystake was in not cutting off the first column of the model matrix, which is used as input to the glm() function.

my.model <- model.matrix(f, data=my.data)[-1]

GiorgioG
  • 111