Calculation of UCL/LCL for X Bar & R charts for n>>10

[Kanedl@ldschurch.org]

[The following is from a non-subscriber - pls copy kanedl@ldschurch.org or s/he will not
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I have an automatic monitor that samples at 100%, so my
 sample count (n) is very large (300-6000.  How to I 
calculate UCL and LCL for XBar and R charts.  I only have a 
table for sample sizes of 2-10, and I do not have the 
actual formula to allow me to scale to large sample sizes.



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