Study Experimental Design at Conestoga College. April 28, 2016 Course Code: QUAL1070 To register for this course, visit the Conestoga College Continuing Education Website. This Experimental Design (DoE) course shows you how to design experiments statistically. Discussions on hypothesis testing, normal probability plots, full and fractional factorials – including main effects, interactions, and prediction of […]

## Control Chart Constants – How to Derive A2 and E2 Learn how to derive the E2 and A2 control chart constants used to compute control limits for the X-bar and Individuals Charts

Control Chart Constants, where did the A2 and E2 constants come from? In statistical process control (SPC) charting, we use the A2 and E2 constants to calculate control limits for an Average (X-bar chart) and Individuals charts. But where do the A2 and E2 constants come from? Let’s look at the following example, for an X-bar […]

## D2 Values Used in Gage Repeatability and Reproducibility Studies Continuing series on Gage R&R Studies

D2 values appear in Gage RR equations when using the Average and Range method. The Average and Range method uses constants to estimate Gage Repeatability and Reproducibility (GR&R). There are two “K” constants “K1” and “K2”. Quality Engineers use them to estimate repeatability and reproducibility. Each of these “K” constants use d2 values in their […]

## Estimating Gage Repeatability Using Range Statistics Continuing series of articles on Gage R&R and Range Statistics

Estimating Gage Repeatability using Range Statistics for one operator is not all that difficult. Is the same true when estimating Gage Repeatability using Range Statistics when using two operators? Let’s discuss this question in more detail… In a previous post we looked at estimating Gage Repeatability using Range Statistics. In that post we examined one […]

## How to Calculate Gage Repeatability Using the Average Range Continuing Series in Gage Repeatability and Reproducibility

How to Calculate Gage Repeatability Using the Average Range. I’m often asked to help Quality Engineers better understand how to perform Gage R&R calculations. So I decided to write several posts about the topic. Over the next few weeks I plan to roll out a number of posts I trust will enlighten everyone. In this […]