how to create a control chart

vgr

New Member
Joined
May 25, 2012
Messages
15
Hi,
I've used trend lines to find the mean and average but for some reason I have not been able to set an upper and lower limit. without introducing a new column.
Please do let me know if there's a way around this.
Thanks
 

mole999

Moderator
Joined
Oct 23, 2004
Messages
9,899
you could draw lines on the chart at the levels you need to display

I've never seen the data used twice to produce other values (though saying that i have managed to copy a chart to itself (copy / paste) maybe that is editable as extra ranges)
 

oldbrewer

Board Regular
Joined
Apr 11, 2010
Messages
10,985
you have found both the mean and the average - can you explain how?

the upper and lower limits are calculated from the variability of the data so col A could be raw data, col B the mean, col C the UCL and col D the LCL

highlight the 4 columns and draw your chart - it is that simple
 

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