Calculates the u control chart for attributes, given a variable sample n and a number of nonconformities u per sample. The plotted values in graph are the average number of nonconformities per unit.
Usage
u_gr(U)
Value
in.control
The under control row list for the u chart
out.control
The out of control row list for the u chart
Iteraciones
The number of iterations, in this function always will be the first and the last one
data.0
The original data frame
data.1
Subsetting the data frame with under control rows
bin
The binary values for out of control equal to one and under control equal to zero
Limites de Control Grafica u
The u chart control limits vector
Conclusion del proceso
The same results in a phrase as the bin values
Arguments
U
A data frame containing the number d of nonconformities per sample, the sample n can be variable. Note that the variable names must be lowercase letter, say d and n.
Author
Erick Marroquin
References
Montgomery, D.C. (2005) Introduction to Statistical Quality Control, 5th ed. New York: John Wiley & Sons, ISBN 0-471-65631-3