Hi,

 

I am currently using R extensively to develop a statistical model and
currently learning its capabilities. 

I am trying to develop a logistic regression model using glm and stepAIC

 

I constructed my formula as y ~ a + b + c + d

Now I wish to study the interaction between variables. So I did y ~ a +
b + c:d + d

 

The software generated the coefficients for a, b , c:d, d

 

Now I want to compute the probability for various events using the
logistic regression model formula

 

  Prob = exp(y)/(1+exp(y))

 

How do I compute the value of y for the formula with interaction
variables ? what does c:d represent given a dataset ?

 

Regards,

 

Balavelan


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