Andy,
I already have done all the necessary calculations, and even have my Cusum
chart working perfectly, I also use the UCL and LCL charts, and a few others.
But I was just wondering if anyone knew how to use excel to automatically
draw the v-mask. The calculations are relatively easy, here is a website that
indicates how to manually draw a vmask, but I can't seem to translate it into
excel.
http://www.itl.nist.gov/div898/handb...on3/pmc323.htm

"Andy Pope" wrote:

Hi,

Well for the control chart there are explanations here,
http://processtrends.com/pg_charts_control_chart.htm
http://peltiertech.com/Excel/Charts/RunChtLines.html

As for a particular formula to calculate the v-mask lines we would need
much more detail.

Cheers
Andy

JerryA wrote:
Del is correct about the v-mask. Its useful for determining if a process
change is neccesary. And yes, the lines are straight, and actualy come to a
point off the chart. If any results of the cusum show outside the lines, then
something has occured. I just was wondering if anyone knows the formula to
make it work on excel.

"JerryA" wrote:


Anyone know how to take a Cusum chart and plot a v-mask on it?

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info