Logistic regression giving negative predictions?

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I am doing a binomial-family logistic regression, but my predictions on the datasets are almost all negative. Is this because the resulting predictions are actually log-likelihoods, not pure probability estimates? And could someone point me to a good resource to learn more about how logistic regressions are determined?

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The output is probably on a logit scale. Try to add type="response"' to the predict function. I.e., ' predict(your.model, new.data, type="response") '