We've been developing intuitive high-quality statistical software at an affordable price, backed up by fast friendly customer service for over 25 years...
Office hours: 9am-5pm GMT Mon-Fri
It's Tuesday 5:02 PM and the office is closed - e-mail us and we'll get back to you as soon as possible.
A time-weighted control chart detects small shifts in a process mean.
Time-weighted control charts combine information from the current and past observations. They are more sensitive to detecting small shifts in the process mean than a Shewhart chart, but slower at detecting large shifts.
The charts only monitor the process mean; monitoring the process variability requires the use of some other technique.