• control charts

    Estimating Control Chart Constants with R

    In this post, I will show you how a very basic R code can be used to estimate quality control constants needed to construct X-Individuals, X-Bar, and R-Bar charts. The value of this approach is that it gives you a mechanical sense of where these constants come from and some reinforcement on their application. If you work in a production or quality control environment, chances are you've made or seen a control chart. If you're new to control charting or need a refresher check out Understanding Statistical Process Control, Wheeler et. al. If you want to dive in and start making control charts with R, check out R packages ggQC:…