Can anyone show me how to test for significant simple slopes of a 3-way
interaction, with covariates.

my equation
tmod<-(glm(PCL~ rank.f + gender.f + MONTHS + CEXPOSE.M + bf.m +
MONTHS*CEXPOSE.M*bf.m,
data=mhatv, family=gaussian ,na.action=na.omit))

Thank you
Mike

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