statistic mesure of calibration A measure of association between a variable representing known or true values and a variable representing measured or predicted values. Brian S. Alper, Joanne Dehnbostel, Harold Lehmann, Kenneth Wilkins Calibration is often used for measurement devices. The known or true values may be called the reference standard. Calibration is also used for predictive models and other contexts comparing computed or expected probabilities with empirical frequencies. A measure of calibration indicates the degree to which the computed values are underestimated or overestimated. Philippe Rocca-Serra SEVCO group ready for release