Exponentially Weighted Moving Average Chart Page 3

ST 435/535

Statistical Methods for Quality and Productivity Improvement / Statistical Process Control

In R:

Use the simulated data used as an example of the cusum chart; recall

that

= 10 and

= 1; use

= 0 1 and L = 2 7:

library(qcc)

summary(ewma(x, center = 10, std.dev = 1,

lambda = 0.1, nsigmas = 2.7))

Notes

The control limits change with i, but approach asymptotes.

The same two observations fall outside the control limits as in

the Cusum control chart.

3 / 8

Cusum and Moving Average Control Charts

EWMA Control Chart

0 votes

Parent category: Business