Graphics
Model: y = f(x;beta) + e = (beta(1) + beta(2)x + beta(3)x^2) / (1 + beta(4)x + beta(5)x^2)
Fitted and Observed Values
versus
Predictor Variable

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

Residuals vs. Predictor Variable