xBar_rBar_UCL {ggQC}

Mean of Subgroup Means Upper Control Limit (UCL)

Description

Calculates the mean of subgroup means upper control limit used when constructing a xBar-R charts.

Usage

xBar_rBar_UCL(data, value, grouping, n = NULL, natural = F,
  formula = NULL)

Arguments

data

data frame to be processed

value

numeric vector in a data frame with values of interest.

grouping

single factor/variable to split the data frame "values" by.

n

a number indicating a hypothetical subgroup size other than, function determined subgroup n determined by the floor length of subgroup values.

natural

logical, if TRUE calculate limits for individuals (n=1) else calculate for n determined by the floor length of subgroup values

formula

a formula, such as y ~ x1 + x2, where the y variable is numeric data to be split into groups according to the grouping x factors/variables

Value

A number; mean of subgroup means upper control limit.

Examples

set.seed(5555)
df <- data.frame(v=rnorm(60, 0, 1), g=rep(c("A","B","C","D","E"), each=12))
xBar_rBar_UCL(data = df, formula = v~g)