graphical procedure used to separate a SEMIVARIABLE EXPENSE (or mixed cost) into the fixed and the variable cost portion. In this method, a semivariable expense is plotted on the vertical axis (or y-axis) and activity measure is plotted on the horizontal axis (or x-axis). Then a regression line is fitted by visual inspection of the plotted data, as shown in the following graph. The scattergraph method is relatively easy to use and simple to understand. However, it should be applied with extreme caution, because it does not provide an objective test for assuring that the regression line drawn is the most accurate fit for the underlying observations.