mc.wdemingConstCV: Calculate Weighted Deming Regression

In mcr: Method Comparison Regression

Calculate Weighted Deming Regression

Description

Calculate weighted deming regression with iterative algorithm suggested by Linnet. This algorithm is avalaible only for positive values. But even in this case there is no guarantee that the algorithm always converges.

Usage

mc.wdemingConstCV(X, Y, error.ratio, iter.max = 30, threshold = 1e-06)

Arguments

X	measurement values of reference method.
Y	measurement values of test method.
error.ratio	ratio between squared measurement errors of reference- and test method, necessary for Deming regression (Default is 1).
iter.max	maximal number of iterations.
threshold	threshold value.

Value

a list with elements

b0	intercept.
b1	slope.
xw	average of reference method values.
iter	number of iterations.

References

Linnet K. Evaluation of Regression Procedures for Methods Comparison Studies. CLIN. CHEM. 39/3, 424-432 (1993).

Linnet K. Estimation of the Linear Relationship between the Measurements of two Methods with Proportional Errors. STATISTICS IN MEDICINE, Vol. 9, 1463-1473 (1990).

mcr documentation built on Sept. 23, 2024, 5:10 p.m.