X-bar and R Control Charts

Draws the X-bar control chart and the R (range) control chart side by side in the same graphics window, using estimated Phase I control limits. Both charts share the same subgroup data.

Usage

cchart.Xbar_R(x, sizes)

Arguments

x: Phase I data. Matrix or data frame with subgroups in rows.
sizes: Subgroup size(s). A single integer (equal sizes) or a vector.

Value

Draws two control charts side by side. Returns nothing.

Phase convention

Phase I --- control limits estimated from the data for both charts.

References

Montgomery, D.C., (2009). "Introduction to Statistical Quality Control". Chapter 6. Wiley.

Author

Daniela R. Recchia, Emanuel P. Barbosa

Examples


data(pistonrings)
attach(pistonrings)
cchart.Xbar_R(pistonrings[1:25, ], 5)


#> List of 11
#>  $ call      : language qcc(data = x, type = "R", add.stats = FALSE)
#>  $ type      : chr "R"
#>  $ data.name : chr "x"
#>  $ data      : num [1:25, 1:5] 74 74 74 74 74 ...
#>   ..- attr(*, "dimnames")=List of 2
#>  $ statistics: Named num [1:25] 0.038 0.019 0.036 0.022 0.026 ...
#>   ..- attr(*, "names")= chr [1:25] "1" "2" "3" "4" ...
#>  $ sizes     : Named int [1:25] 5 5 5 5 5 5 5 5 5 5 ...
#>   ..- attr(*, "names")= chr [1:25] "1" "2" "3" "4" ...
#>  $ center    : num 0.0228
#>  $ std.dev   : num 0.00979
#>  $ nsigmas   : num 3
#>  $ limits    : num [1, 1:2] 0 0.0481
#>   ..- attr(*, "dimnames")=List of 2
#>  $ violations:List of 2
#>  - attr(*, "class")= chr "qcc"