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VFP (version 1.4.1)

Variance Function Program

Description

Variance function estimation for models proposed by W. Sadler in his variance function program ('VFP', ). Here, the idea is to fit multiple variance functions to a data set and consequently assess which function reflects the relationship 'Var ~ Mean' best. For 'in-vitro diagnostic' ('IVD') assays modeling this relationship is of great importance when individual test-results are used for defining follow-up treatment of patients.

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Version

Install

install.packages('VFP')

Monthly Downloads

356

Version

1.4.1

License

GPL (>= 2)

Maintainer

Andre Schuetzenmeister

Last Published

November 8th, 2022

Functions in VFP (1.4.1)

fit.EP17

Fit CLSI EP17 Model Using log-transformed X and Y.
conditionHandler

Condition-Handling Without Losing Information.
getMat.VCA

Transform list of VCA-object into VFP-matrix required for fitting.
legend.rm

Add Legend to Right Margin.
fit.vfp

Estimate (Im)Precision-Profiles Modeling the Relationship 'Var ~ Mean'.
powfun3

Internal Function Model 3.
powfun3simple

Internal Function Model 3.
deriveCx

Determine C5 and C95 or any Concentration Cx.
powfun6

Internal Function Model 6.
powfun6simple

Internal Function Model 6.
coef.VFP

Extract Model-Coefficients from VFP-Objects.
bt.coef

Back-Transformation of Estimated Coefficients.
powfun2simple

Internal Function Model 2.
plot.VFP

Plot VFP-Ojbects.
powfun5

Internal Function Model 5.
powfun5simple

Internal Function Model 5.
powfun9simple

Internal Function Model 9.
powfun8simple

Internal Function Model 8.
powfun4

Internal Function Model 4.
powfun4simple

Internal Function Model 4.
powfun8

Internal Function Model 8.
precisionPlot

Precision Performance Plot of Qualitative Tests.
predictMean

Finding X-Value for Given Y-Value Using a Bisection-Approach.
print.VFP

Print Objects of Class 'VFP'
summary.VFP

Summary Objects of Class 'VFP'
t.coef

Transformation of Coefficients.
powfun7simple

Internal Function Model 7.
powfun7

Internal Function Model 7.
predict.modelEP17

Predict Method for Objects of Class 'modelEP17'.
predict.VFP

Predict Method for Objects of Class 'VFP'.
MultiLotReproResults

Result of a Real-World Precsion Experiment on 10 Samples
RealData1

Result of a Real-World Precsion Experiment on 10 Samples
VFP-package

(V)ariance (F)unction (P)rogram
ReproData

Serum Work Area Example Data of a Reproducibility Experiment
Signif

Adapted Version of Function 'signif'
addGrid

Add a Grid to an Existing Plot.
T4S9_99

Example Data T4S9_99.VFP (T4 RIA) from the Variance Function Program 12.0 from Sadler
as.rgb

Convert Color-Name or RGB-Code to Possibly Semi-Transparent RGB-code.
B2mIntra_98

Example Data B2mIntra_98.VFP (Beta-2-microglobulin RIA) from the Variance Function Program 12.0 from Sadler
Glucose

Example Data Glucose.VFP from the Variance Function Program 12.0 from Sadler