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124 4. LINEAR MODELSheight60 80 100 140 180height60 80 100 140 180height60 80 100 140 180(a) (b) (c)-2 -1 0 1 2weight.s-2 -1 0 1 2weight.s-2 -1 0 1 2weight.sFIGURE 4.10. Polynomial regressions of height on weight (standardized),for the full !Kung data. In each plot, the raw data are shown by the circles.e solid curves show the path of µ in each model, and the shaded regionsshow the 95% interval of the mean (close to the solid curve) and the 95%interval of predictions (wider). (a) Linear regression. (b) A second orderpolynomial, a parabolic regression. (c) A third order polynomial, a cubicregression.height.PI

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