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Modeling and Multivariate Methods - SAS

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248 Performing Nonlinear Regression Chapter 9<br />

Nonlinear Fitting with Fit Curve<br />

Table 9.1 Fit Curve Model Formulas (Continued)<br />

Model<br />

Logistic 2P<br />

Formula<br />

---------------------------------------------<br />

1<br />

1 + Exp( – a( x–<br />

b)<br />

)<br />

a = Growth Rate<br />

b = Inflection Point<br />

Logistic 3P<br />

c<br />

---------------------------------------------<br />

1 + Exp( – a( x–<br />

b)<br />

)<br />

a = Growth Rate<br />

b = Inflection Point<br />

c = Asymptote<br />

Logistic 4P<br />

Logistic 5P<br />

Gompertz 3P<br />

c + d–<br />

c<br />

1 ---------------------------------------------<br />

+ Exp( – a( x – b)<br />

)<br />

a = Growth Rate<br />

b = Inflection Point<br />

c = Lower Asymptote<br />

d = Upper Asymptote<br />

d – c<br />

c + ----------------------------------------------------<br />

( 1 + Exp( – a( x–<br />

b)<br />

)) f<br />

a = Growth Rate<br />

b = Inflection Point<br />

c = Asymptote 1<br />

d = Asymptote 2<br />

f = Power<br />

aExp( – Exp( – b( x–<br />

c)<br />

))<br />

a = Asymptote<br />

b = Growth Rate<br />

c = Inflection Point

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