Given a set of bivariate data (x, y), to impute a value of y corresponding to some value of x at which there is no measurement of y is called extrapolation, if the value of x is outside the range of the measured values of x.
Given a set of bivariate data (x, y), to impute a value of y corresponding to some value of x at which there is no measurement of y is called extrapolation, if the value of x is outside the range of the measured values of x.