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VFP (version 1.4.3)

Variance Function Program

Description

Variance function estimation for models proposed by W. Sadler in his variance function program ('VFP', www.aacb.asn.au/AACB/Resources/Variance-Function-Program). 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

371

Version

1.4.3

License

GPL (>= 2)

Maintainer

Andre Schuetzenmeister

Last Published

January 27th, 2025

Functions in VFP (1.4.3)

RealData1

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

Estimate (Im)Precision-Profiles Modeling the Relationship 'Var ~ Mean'.
fit_ep17

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

Transform list of VCA-object into VFP-matrix required for fitting.
powfun8simple

Internal Function Model 8.
powfun8

Internal Function Model 8.
VFP-package

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

Add Legend to Right Margin.
as_rgb

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

Back-Transformation of Estimated Coefficients.
add_grid

Add a Grid to an Existing Plot.
powfun5

Internal Function Model 5.
coef.VFP

Extract Model-Coefficients from VFP-Objects.
condition_handler

Condition-Handling Without Losing Information.
powfun3

Internal Function Model 3.
powfun3simple

Internal Function Model 3.
powfun4

Internal Function Model 4.
ReproData

Serum Work Area Example Data of a Reproducibility Experiment
T4S9_99

Example Data T4S9_99.VFP (T4 RIA) from the Variance Function Program 12.0 from Sadler
powfun5simple

Internal Function Model 5.
powfun9simple

Internal Function Model 9.
powfun4simple

Internal Function Model 4.
predict.VFP

Predict Method for Objects of Class 'VFP'.
precision_plot

Precision Performance Plot of Qualitative Tests.
predict_mean

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

Plot VFP-Ojbects.
powfun2simple

Internal Function Model 2.
Glucose

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

Determine C5 and C95 or any Concentration Cx.
t_coef

Transformation of Coefficients.
.onLoad

Keep backward compatibility by assigning new to old function names when loading the package. Old name did not comply to new CRAN package check rules.
powfun7

Internal Function Model 7.
powfun7simple

Internal Function Model 7.
powfun6

Internal Function Model 6.
powfun6simple

Internal Function Model 6.
predict_model_ep17

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

Print Objects of Class 'VFP'
signif2

Adapted Version of Function 'signif'
summary.VFP

Summary Objects of Class 'VFP'
B2mIntra_98

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

Result of a Real-World Precsion Experiment on 10 Samples