u_gr: The u chart control for attributes

In XRSCC: Statistical Quality Control Simulation

Description

Calculates the u control chart for attributes, given a variable sample n and a number of nonconformities u per sample. The plotted values in graph are the average number of nonconformities per unit.

Usage

u_gr(U)

Arguments

U	A data frame containing the number d of nonconformities per sample, the sample n can be variable. Note that the variable names must be lowercase letter, say d and n.

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 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, P_it, NP_it, C_it, U_it

Examples

data(udata2)
u_gr(udata2)

Example output

[1] "Proceso fuera de Control en Grafica U"
$in.control
 [1]  1  2  3  4  5  7  8  9 10 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26

$out.control
[1]  6 20

$Iteraciones
[1] 1

$data.0
    d    n
1  21 1000
2  24 1000
3  16 1000
4  12 1000
5  15 1000
6   5 1000
7  28 1000
8  20 1000
9  31 1000
10 25 1000
11 20 1000
12 24 1000
13 16 1000
14 19 1000
15 10 1000
16 17 1000
17 13 1000
18 22 1000
19 18 1000
20 39 1000
21 30 1000
22 24 1000
23 16 1000
24 19 1000
25 17 1000
26 15 1000

$data.1
 [1] 0.021 0.024 0.016 0.012 0.015 0.028 0.020 0.031 0.025 0.020 0.024 0.016
[13] 0.019 0.010 0.017 0.013 0.022 0.018 0.030 0.024 0.016 0.019 0.017 0.015

$bin
[1] 1

$`Limites de Control Grafica U`
      LCI.u       LCS.u        LC.u 
0.006481447 0.033210861 0.019846154 

$`Conclusion del proceso`
[1] "Proceso fuera de Control en Grafica U"

XRSCC documentation built on May 2, 2019, 5:11 a.m.