X_it {XRSCC}

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)