A synthetic dataset modelled on classical pharmaceutical quality control. Tablet weights are recorded in subgroups of 5 tablets each, across 25 production batches. Target weight is 250 mg with a process sigma of 1.5 mg; a small mean shift to 251.5 mg is embedded in subgroups 18-25.
Format
A tibble with 125 rows and 3 columns:
- subgroup
Integer batch identifier (1-25).
- tablet
Integer tablet position within the batch (1-5).
- weight
Numeric tablet weight in milligrams.
Examples
fit <- shewhart_xbar_r(tablet_weight, value = weight, subgroup = subgroup)
# \donttest{
ggplot2::autoplot(fit)
# }