After some research in to the topic, I have stumbled upon two journals which address this point. 1. Control Charts for Measurements with Varying Sample ... ... <看更多>

This object may then be used to plot Shewhart charts, drawing OC curves, computes capability indices, and more. qcc(data, type = c("xbar", "R", "S", ... ... <看更多>

#x-Bar library(qcc) x=c(1080͵ 1390͵ 1460͵ 1380͵ 1090͵ 1230) xbarchart = qcc(x, type="xbar.one", std.dev = "SD") #Range library(qcc) ... ... <看更多>