I have searched high and low on the internet and cannot find the answer to my question.

I am conducting a logistic regression (glm) in r to find how input variables influence my dependant dichotomous value (present/absent).

My question is can my independent variables be in the form of 0 and 1, i.e. absent or present? If this is not possible why not and how would this impact my outcome?



Yes, independent variables in linear models can be dichotomous, either 0 or 1. These variables are usually called "dummy variable" and are frequently used for nominal data of all kinds. "dummy variable" will be a usefull search engine term. Read the first sentence in this pdf: http://psych.unl.edu/psycrs/statpage/logistic_eg1.pdf

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