X-bar Shewhart Control Chart for phase II.

Builds the x-bar control chart for phase II.

cchart.Xbar2(x, x2bar, sigma, sizes)

Arguments

x: The data to be plotted.
x2bar: The mean of means.
sigma: The standard deviation of the data.
sizes: A value or a vector of values specifying the sample sizes associated with each group.

Value

Return a x-bar control chart for phase II.

Details

To use this function it is necessary to have the output given by the function XbarI.

Author

Daniela R. Recchia, Emanuel P. Barbosa

Examples


data(pistonrings)
stat <- cchart.Xbar1(pistonrings[1:25, ], 5)

cchart.Xbar2(pistonrings[26:40, ], stat[[1]][1], stat[[1]][2], 5)

#> List of 11
#>  $ call      : language qcc(data = x, type = "xbar", center = x2bar, std.dev = sigma)
#>  $ type      : chr "xbar"
#>  $ data.name : chr "x"
#>  $ 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"