U_it {XRSCC}

Iteration of u control chart for attributes

Description

Calculates the iteration i'th for the control limits of c chart using the results obtained in c_gr and previous U_it iteration.

Usage

U_it(prev.results)

Arguments

prev.results

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

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 \emph{u}

The u 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, NP_it, C_it

Examples

data(udata2)
r1<-u_gr(udata2)
r2<-U_it(r1)