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My aim is to carry out a generalized linear model (glm) with 1 response variable and 13 explanatory variables.Unfortunately 3 out of the 10 explanatory variables contain NA values (2/3 of data set of this 3 variables are NA values). I realized that the "step" function does not work with NA values (https://stackoverflow.com/questions/11819472/why-does-the-number-of-rows-change-during-aic-in-r-how-to-ensure-that-this-does). Therfore my question: How can I proceed to automatically improve my glm without eliminating my sites with NA values?

This question has been duplicated (I do not understand why - it seems as if sbd migrated it): R Linear model step NA values

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