I have been looking for an answer to my question here stackExchange and by googling, but although some have had similar questions, I am not sure, I have found the right answer.
I am running a logistic regression in which I am analyzing the probability of a child being placed in foster care. Some of my independent variables are related to the childs parents - for example income and education. However, for some of the children a mother or a father is not present, and I therefore don't know their income, education etc. My question is, should I code the income for a missing parent to be zero or should I just leave it blank? I should note that for both the mother and the father, I have already created a binary variable that tells if the parent is unknown.
If I leave the income for a missing father blank, does that mean, that the child with the missing father and missing income, isn't a part of my regression?