I am wondering how to obtain the model/equation at each level automatically
in a regression model with a few factors
without looking at summary of the lm model. For example, consider

lm.factors <- lm(y ~ x1 + factor(x2)*factor(x3)+x4*factor(x5))

The coefficients of lm.factors in summary(lm.factors) might be complicated.
I would like to have the equation at each level from lm.factor.
Could you please let me know how to obtain the equation of lm.factors at
each level automatically (not looking at summary(lm.factors))?
Thanks,

-Chunlin

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