Fit Curve Model Formulas provides the formulas for the models on the Fit Curve red triangle menu.
 Model Formula Polynomials where k is the order of the polynomial. These models can also be fit using the Fit Model and Fit Y by X platforms. Logistic 2P a = Growth Rate b = Inflection Point Logistic 3P a = Growth Rate b = Inflection Point c = Asymptote Logistic 4P a = Growth Rate b = Inflection Point c = Lower Asymptote d = Upper Asymptote Logistic 5P a = Growth Rate b = Inflection Point c = Asymptote 1 d = Asymptote 2 f = Power Gompertz 3P a = Asymptote b = Growth Rate c = Inflection Point Gompertz 4P a = Lower Asymptote b = Upper Asymptote c = Growth Rate d = Inflection Point Exponential 2P a = Scale b = Growth Rate Exponential 3P a = Asymptote b = Scale c = Growth Rate Biexponential 4P a = Scale 1 b = Decay Rate 1 c = Scale 2 d = Decay Rate 2 Biexponential 5P a = Asymptote b = Scale 1 c = Decay Rate 1 d = Scale 2 f = Decay Rate 2 Mechanistic Growth a = Asymptote b = Scale c = Growth Rate Gaussian Peak a = Peak Value b = Critical Point c = Growth Rate Lorentzian Peak a = Peak Value b = Growth Rate c = Critical Point One Compartment Oral Dose a = Area Under Curve b = Elimination Rate c = Absorption Rate Two Compartment IV Bolus Dose α = β = a = Initial Concentration b = Transfer Rate In c = Transfer Rate Out d = Elimination Rate Michaelis Menten a = Max Reaction Rate b = Inverse Affinity
Parallelism Test
Gives the relative potencies. There is a report for each level of the grouping variable. The relative potency is exp(EC50), where EC50 is the point at which the middle response value is obtained. For the Logistic 2P, 3P, and 4P, the relative potency is exp(inflection point parameter).
Parameter Comparison for Growth Rate Estimates
The Equivalence Test report gives an analysis for testing the equivalence of models across levels of the grouping variable (Equivalence Test). After selecting the option, you specify the level of the grouping variable that you want to test against every other level. There is a report for every level versus the chosen level. Select Equivalence Test from the fitted model’s red triangle menu to add the report.
Equivalence Test