View source: R/shrinkage_mean.R
shrinkage_mean | R Documentation |
This function calculates the shrinkage (proportional reduction in the standard deviation) of a weighted mean of assessments given the reliability coefficient of each assessment, the correlations between them, and the weights.
shrinkage_mean(rely, r, w = NA)
rely |
A vector of reliability coefficients. |
r |
Either a correlation matrix or a vector of unique correlations. It is recommended to specify the correlations as a matrix to avoid erronous pairings of assessment correlations with reliability coefficients and weights, since this can be confusing if the correlations are supplied as a vector. Presumes that the correlation matrix has the same order of assessments as the reliability and weight vectors. |
w |
A vector of weights. Will be internally normalized to sum to 1 and presumes the same order of assessments as the correlation matrix and vector of reliabilities. If omitted, it is assumed that all assessments have the same weight. |
The shrinkage factor; a number between zero and one representing the degree of reduction in the standard deviation.
r <- matrix(c( 1, .4, .7, .4, 1, .5, .7, .5, 1 ), 3, 3, byrow = TRUE) shrinkage_mean(rely = c(.9, .85, .88), r = r, w = c(.5, .3, .2))
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