Description Usage Arguments Value Author(s) References See Also Examples
This function accepts fixed parameters for the De Mast-Van Wieringen Model of a single rater and formats them, so meaningful parametric functions can be displayed with the plot() function.
1 | make.rater(alpha,cutpoints)
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alpha |
‘positive scalar’ the rater's discrimination parameter. |
cutpoints |
‘vector’ H-1 (ordered values) corresponding to an H-point ordinal scale. |
rater |
‘rater’ a list of rater parameters |
Ken Ryan
de Mast, J. and van Wieringen, W.N. (2010). “Modeling and Evaluating Repeatability and Reproducibility of Ordinal Classifications.” Technometrics, 52(1), 94-106.
1 2 3 | (rater1=make.rater(1,c(-1.7,-0.5,1.6))) #3 cutpoints, so H=4
(prob=compute.q(rater1,.1)) #probabilities of 1,2,3,4 if part quality is x=.1
sum(prob) #should sum to one
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