getCoeffFun {qAnalyst} | R Documentation |
getCoeffFun
returns the parameters from Montgomery book A6 coefficients table. Coefficients from A6 table are used in control charts construction.
getCoeffFun(sampleSize, coeff)
sampleSize |
A vector of subgroups size. |
coeff |
a string that specifies the required parameters. |
Internal function
A vector of coefficients.
getCoeffFun is a wrapper for getParameter
. getCoeffFun handles missing values, returning NA if subgroup dimension is NA.
Giorgio Spedicato and Andrea Spano'
Montgomery, Statistical Quality Control
##Simple example
sgDim=c(10,5,8,10)
getCoeffFun(sgDim,"d3")
# 0.797 0.864 0.820 0.797