Gompertz (log y = false): grofit

Comparing BGFit with R model's description for S5 measurement:

Test estimations with grofit package

Description

This model will transform your data to y* = y - y0 and fit the transformed data to the model. And then revert the transformation and show the results in the initial space.

It assumes that the data is already in log scale.

M. H. Zwietering, I. Jongenburger, F. M. Rombouts, and K. van ’t Riet. Modeling of the bacterial growth curve. Applied and Environmental Microbiology, 56(6):1875–1881, June 1990.

Listing 5 parameters

TitleEstimated parameterDescriptionBottom range for estimationTop range for estimation
A0.07791557A=ln( Nmax / N0)
λ-6.794163lag until exponential growth occurs
μ max.0.003080715maximum growth rate
Ln(N(0))0.0Initial value for N(n/a)(n/a)
Optimal Costnot used in the solver(n/a)(n/a)
Download table as .csv
RMSEclick here for more information

Root Mean Square Error (RMSE):

Rmse

For more information: link to Wikipedia articleTrans
R2click here for more information R_square

For more information: link to Wikipedia articleTrans
Biasclick here for more information

Bias Factor (Bf):

Bias

For more information check Ross, T. Indices for performance evaluation of predictive models in food microbiology. Journal of Applied Bacteriology 81, 501–508 (1996).

(link to journal articleTrans )
Accuracyclick here for more information

Accuracry Factor (Af):

Accuracy

For more information check Ross, T. Indices for performance evaluation of predictive models in food microbiology. Journal of Applied Bacteriology 81, 501–508 (1996).

link to journal articleTrans
0.00246 0.96124 1.00189 0.99812

Gompertz (log y = false)'s Curve