X-bar Control Chart for phase I and II.

Builds the x-bar control chart for phase I or phase II.

cchart.Xbar(
  x1 = NULL,
  n1 = NULL,
  x2 = NULL,
  n2 = NULL,
  x2bars = NULL,
  sigma = NULL
)

Arguments

x1

The phase I data to be plotted.

n1

A value or a vector of values specifying the sample sizes associated with each group for the phase I data.

x2

The phase II data to be plotted.

n2

A value or a vector of values specifying the sample sizes associated with each group for the phase II data.

x2bars

The mean of means from phase I.

sigma

The standard deviation from phase I.

Value

Return an x-bar control chart.

See also

cchart.Xbar1, cchart.Xbar2

Author

Daniela R. Recchia, Emanuel P. Barbosa

Examples

data(pistonrings)
cchart.Xbar(x1 = pistonrings[1:25, ], n1 = 5)

cchart.Xbar(x1 = pistonrings[1:25, ], n1 = 5, x2 = pistonrings[26:40, ], n2 = 5)

#> List of 11
#>  $ call      : language qcc(data = x2, type = "xbar", center = x2bars, std.dev = sigma)
#>  $ type      : chr "xbar"
#>  $ data.name : chr "x2"
#>  $ data      : num [1:15, 1:5] 74 74 74 74 74 ...
#>   ..- attr(*, "dimnames")=List of 2
#>  $ statistics: Named num [1:15] 74 74 74 74 74 ...
#>   ..- attr(*, "names")= chr [1:15] "26" "27" "28" "29" ...
#>  $ sizes     : Named int [1:15] 5 5 5 5 5 5 5 5 5 5 ...
#>   ..- attr(*, "names")= chr [1:15] "26" "27" "28" "29" ...
#>  $ center    : num 74
#>  $ std.dev   : num 0.00979
#>  $ nsigmas   : num 3
#>  $ limits    : num [1, 1:2] 74 74
#>   ..- attr(*, "dimnames")=List of 2
#>  $ violations:List of 2
#>  - attr(*, "class")= chr "qcc"