getParameterFun {qAnalyst} | R Documentation |
getParameterFun
returns the value of a parameter given subgroup size and parameter name.
getParameterFun(n, parameter)
n |
subgroups length |
parameter |
string containing the name of parameters from A6 table, that is: "A", "A2", "A3", "c4", "c4rec", "B3", "B4", "B5", "B6", "d2", "d2rec", "D3", "D4", "D5", "D6". |
Tabulated values are used if subgroup size is less than 25. Otherwise, Montogmery SQC book's formulas are used.
Value of the requested parameter given sample size.
Montgomery original table does not report values for n=1. Constants "d2" and "d4" for n=1 have been integrated from Wheeler and Chambers (1992).
No notes
Andrea Spano'
Montgomery, Statistical Quality Control; Wheeler and Chambers (1992). Undenstanding Statistical Process control
#a simple example getParameterFun(5,"d2")