Hi All:
the package "MuMIn" can be used to select the model based on AIC or AICc.
The code is as follows:

data(Cement)
lm1 <- lm(y ~ ., data = Cement)
dd <- dredge(lm1,rank="AIC")
print(dd)

If I want to select the model by BIC, what code do I need to use? And when
to select the best model based on AIC, what the differences between the
function "dredge" in package"MuMIn" and the function "stepAIC" in package
"MASS"

Many thanks

best wishes

XIN LI

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