"“These considerations suggest arule of thumb. If the probabilities that you’re modeling are extreme—close to 0or 1—then you probably have to use logistic regression. But if the probabilities are more moderate—say between .20 and .80, or a little beyond—then the linear and logistic models fit about equally well, and the linear model should be favored for its ease of interpretation.”

My question is how do you know if most probabilities are between those values. Ideally I would like the answer in how do you find this in SAS, but I will take what I can get."