Learn R Programming

VFP (version 1.4.4)

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.

Copy Link

Version

Install

install.packages('VFP')

Monthly Downloads

237

Version

1.4.4

License

GPL (>= 2)

Maintainer

Andre Schuetzenmeister

Last Published

April 8th, 2025

Functions in VFP (1.4.4)

fit_ep17

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

Estimate (Im)Precision-Profiles Modeling the Relationship 'Var ~ Mean'.
powfun5

Internal Function Model 5.
plot.VFP

Plot VFP-Ojbects.
get_mon

Determine Monotony of Vector.
powfun3simple

Internal Function Model 3.
powfun2simple

Internal Function Model 2.
predict_model_ep17

Predict Method for Objects of Class 'modelEP17'.
powfun3

Internal Function Model 3.
print.VFP

Print Objects of Class 'VFP'
powfun5simple

Internal Function Model 5.
legend_rm

Add Legend to Right Margin.
powfun8

Internal Function Model 8.
summary.VFP

Summary Objects of Class 'VFP'
powfun8simple

Internal Function Model 8.
powfun4

Internal Function Model 4.
ReproData

Serum Work Area Example Data of a Reproducibility Experiment
t_coef

Transformation of Coefficients.
predict.VFP

Predict Method for Objects of Class 'VFP'.
predict_mean

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

Determine C5 and C95 or any Concentration Cx.
T4S9_99

Example Data T4S9_99.VFP (T4 RIA) from the Variance Function Program 12.0 from Sadler
powfun4simple

Internal Function Model 4.
precision_plot

Precision Performance Plot of Qualitative Tests.
powfun9simple

Internal Function Model 9.
.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.
powfun6

Internal Function Model 6.
powfun6simple

Internal Function Model 6.
powfun7

Internal Function Model 7.
powfun7simple

Internal Function Model 7.
residuals.VFP

Residuals Method for Objects of Class 'VFP'.
signif2

Adapted Version of Function 'signif'
B2mIntra_98

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

Extract Model-Coefficients from VFP-Objects.
VFP-package

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

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

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

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

Condition-Handling Without Losing Information.
get_model

Select the Best Fitting Model.
get_mat

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