| Noun | 1. | regression of y on x - the equation representing the relation between selected values of one variable (x) and observed values of the other (y); it permits the prediction of the most probable values of y statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters regression analysis - the use of regression to make quantitative predictions of one variable from the values of another equation - a mathematical statement that two expressions are equal |