qicharts2 - Quality Improvement Charts
Functions for making run charts, Shewhart control charts
and Pareto charts for continuous quality improvement. Included
control charts are: I, MR, Xbar, S, T, C, U, U', P, P', and G
charts. Non-random variation in the form of minor to moderate
persistent shifts in data over time is identified by the Anhoej
rules for unusually long runs and unusually few crossing
[Anhoej, Olesen (2014) <doi:10.1371/journal.pone.0113825>].
Non-random variation in the form of larger, possibly transient,
shifts is identified by Shewhart's 3-sigma rule [Mohammed,
Worthington, Woodall (2008) <doi:10.1136/qshc.2004.012047>].
