NP_it {XRSCC}

Iteration of np control chart for attributes

Description

Calculates the iteration i'th for the control limits of p chart using the results obtained in np_gr or further NP_it iterations.

Usage

NP_it(prev.results)

Arguments

prev.results

Is a list of previous results obtained by the np_gr function. In other cases, needs more than one iteration, to obtain the true control limits for np chart before take conclusions about the process.

Value

in.control

The under control row list for the np chart in this iteration

out.control

The out of control row list for the np chart

Iteraciones

The number of iterations, It is assumed to be the second or later

data.n

The fixed sample size

data.0

The original data frame

data.1

The under control subset after iteration

bin

The binary values for out of control equal to one and under control equal to zero

Limites de Control Grafica \emph{np}

The np 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

p_gr, np_gr, c_gr, u_gr, P_it, C_it, U_it

Examples

data(bottles)
r1<-np_gr(bottles, n=100)
r2<-NP_it(r1)
r3<-NP_it(r2)