Graphics
Model: y = f(x;beta) + e = (beta(1)(x^2 + xbeta(2)) + (x^2 + xbeta(3) + beta(4)) + e
Fitted and Observed Values
versus
Predictor Variable

Fitted and Observed Values vs. Predictor Variable 		Residuals
versus
Predictor Variable

Residuals vs. Predictor Variable