Time-Weighted Charts

EWMA Chart

Before you start

Overview
Data considerations
Example

Perform the analysis

Enter your data
Scale
Labels
Multiple graphs
Data options
EWMA options

Interpret the results

Key results
All statistics and graphs

Methods and formulas

Estimating sigma
EWMA chart
Unbiasing constants d2(), d3(), and d4()
Unbiasing constants c4() and c5()
Unbiasing constant c4'()
Box-Cox