How to run lm models using all possible combinations of several variables and a factor

Question

this is not my subject so I am sorry if my question is badly asked or if the data is incomplete. I am trying to run 31 lineal models which have a single response variable (V

Answer 1

To deal with:

'global.model''s 'na.action' argument is not set and options('na.action') is "na.omit"

require(MuMIn)
data(iris)
options(na.action = "na.fail") # change the default "na.omit" to prevent models
# from being fitted to different datasets in
# case of missing values.
globalmodel <- lm(Sepal.Length ~ Petal.Length + Petal.Width + Species, data = iris)
combinations <- dredge(globalmodel)
print(combinations)