6-17Cubic regressionModel formula....... y = ax3 + bx2 + cx + da.......... regression third coefficientb.......... regression second coefficientc .......... regression first coefficientd.......... regression constant term(y-intercept)Quadratic regressionModel formula....... y = ax2 + bx + ca.......... regression second coefficientb.......... regression first coefficientc .......... regression constant term(y-intercept)k Med-Med GraphWhen it is suspected that there are a number of extreme values, a Med-Med graph can beused in place of the least squares method. This is similar to linear regression, but it minimizesthe effects of extreme values.1(CALC)3(Med)6(DRAW)The following is the Med-Med graph model formula.y = ax + ba.............. Med-Med graph slopeb.............. Med-Med graph y-interceptk Quadratic/Cubic/Quartic Regression GraphA quadratic/cubic/quartic regression graph represents connection of the data points of ascatter diagram. It uses the method of least squares to draw a curve that passes close toas many data points as possible. The formula that represents this is quadratic/cubic/quarticregression.Ex. Quadratic regression1(CALC)4(X2 )6(DRAW)Quartic regressionModel formula....... y = ax4 + bx3 + cx2 + dx + ea.......... regression fourth coefficientb.......... regression third coefficientc .......... regression second coefficientd.......... regression first coefficiente .......... regression constant term (y-intercept)
