SAS Statistical Business Analysis Using SAS 9: Regression and Modeling — Question 29

Which of the following describes a concordant pair of observations in the LOGISTIC procedure?

Answer options

• A. An observation with the event has an equal probability as another observation with the event.
• B. An observation with the event has a lower predicted probability than the observation without the event.
• C. An observation with the event has an equal predicted probability as the observation without the event.
• D. An observation with the event has a higher predicted probability than the observation without the event

Correct answer: D

Explanation

A concordant pair of observations occurs when the predicted probability of an event is greater for the observation with the event compared to the one without it, making option D correct. Options A and C describe situations where the probabilities are equal, which do not reflect a concordant relationship. Option B incorrectly states that the observation with the event has a lower predicted probability, which is contrary to the definition of concordance.