R_it {XRSCC}

Calculates the i'th iteration R Chart

Description

Calculates the iteration i'th for R chart, after the X chart is under control. The function estimates if any value (range) is out of control limits, and returns a values list.

Usage

R_it(prev.results)

Arguments

prev.results

Is a list of previous results obtained by the xrs_gr, followed by X_it function if it is necessary. In other cases, needs more than one iteration to obtain the true control limits for R chart, before take conclusions about the process.

Details

The function stops if the R 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 number of iterations, It is assumed to be the second or later

data.0

The original data frame

data.1

The filtered data frame

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

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 X_it we_rules Cp_X

Examples

data(dato2)
results1<-xrs_gr(dato2)
results2<-X_it(results1)
results3<-R_it(results2)