R_bar_chart: Xbar-R bar chart

In ptds2021/project--G4: Statistical Process Control functions

Description

This function will produce a Shewhart X-bar/R control chart. The Xbar-R control chart is the most commonly used. Xbar/R chart: This function allows you to plots each sample mean to see between-sample variation Useful for identifying special cause changes to the process mean (X), for detecting shifts/trends. Control limits, related to +/- 3 standard deviations, are calculated using Rbar. Points within the control limits are in accordance with the process variation. Those outside the limits are special causes to be analysed

Usage

R_bar_chart(data, request, A2 = 0.483)

Arguments

A2	numeric Constant determined by a normal distribution as a function of the sample size useful for defining the control limits. We consider by default that the number of points in the sample is equal to 6, which gives a constant equal to 0.483.
data.frame	data The data set of the analysis
numeric	request A particular product, with specific production parameters (a value in the data.frame)

Value

A plot displaying the X_bar/R control chart

Author(s)

Özgür Aydemir, Sophie La Gennusa, Louis del Perugia, Daniel Szenes, Francesca Darino

ptds2021/project--G4 documentation built on Dec. 23, 2021, 11:10 p.m.