ggQC: xBar_rBar_LCL – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

xBar_rBar_LCL

Mean of Subgroup Means Lower Control Limit (LCL)

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

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

`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

A number; mean of subgroup means lower control limit.

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

Quality Control Charts for 'ggplot'

v0.0.31

GPL-3 | file LICENSE

Authors

Kenith Grey

Initial release