mc.mmdemingConstCV {mcrPioda}

Calculate Weighted Deming Regression

Description

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

Usage

mc.mmdemingConstCV(
  X,
  Y,
  error.ratio,
  iter.max = 120,
  threshold = 1e-06,
  tauMM = 4.685
)

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.

tauMM

Tukey's tau for bisquare redescending weighting function, default tauMM = 4,685

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).