Odds Ratio

The odds ratio is useful in the interpretation of the results of logistic regression (see Neter, Wasserman, and Kutner, 1989) and is computed from a 2x2 classification table, which displays the predicted and observed classification of cases for a binary dependent variable:

(f11*f22)/(f12*f21)

where fij represents the respective frequencies in the 2x2 table.

See Nonlinear Estimation for more details.