X_it: Calculates the iteration i'th X Chart

In XRSCC: Statistical Quality Control Simulation

Calculates the iteration i'th X Chart

Description

With the results of xrs_gr followed by previous X_it iterations, the function calculates the X control limits charts, using a data frame with a fixed subgroup size n. In the graph plotting, the function estimates if any value (row or subgroup average) is out of control limits, and returns a list with calculations. Also, gives the R chart and control limits, which will be used in R_it function.

Usage

X_it(prev.results)

Arguments

prev.results

Is a list of previous results obtained by the xrs_gr function in the first iteration, or a list of results obtained in further iterations by the X_it function.

Details

The function stops if the X chart is under control already, and also stops if there is not any active graphic device.

Value

in.control	The under control row list for the X chart
R.in.control	The under control row list for the R chart
out.control	The out of control row list for the X chart
Iteraciones	The iterations number, It is assumed to be the second or later
data.0	The original data frame
data.1	The under control subset after iteration
data.r.1	The calculated ranges of data.0
bin	The binary values for out of control equal to one and under control equal to zero, for X and R charts
LX	The X chart control limits vector
LR	The R chart control limits vector
Limites Grafixa X	The X chart control limits vector
Limites Grafixa R	The R chart control limits vector
Conclusion del proceso	The same results in a phrase as the bin values

Note

For the true Range control limits calculation, use R_it.

Author(s)

Erick Marroquin

References

Montgomery, D.C. (2005) Introduction to Statistical Quality Control, 5th ed. New York: John Wiley & Sons, ISBN 0-471-65631-3

See Also

xrs_gr, R_it, Cp_X, we_rules

Examples

data(vol_sample)
results1<-xrs_gr(vol_sample)
results2<-X_it(results1)

XRSCC documentation built on April 3, 2025, 7:29 p.m.