# Large Sample Size - up to 32 - for Control Charts

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#### MikeSeymourAtl

I am looking for A3, B3, and B4 constants to create control limits for a process with larger sample sizes - up to 32 pieces per sample. Can someone point me towards a reliable source? (Would rather not drop \$250 for a text book that MIGHT have the right info for me...)

#### andka907

##### Involved In Discussions
A3 = 3/(c4*sqrt)
B3 = max[0, 1- 3 * sqrt(1-c4^2)/c4]
B4 = 1 + 3sqrt(1-c4^2)/c4

c4 = sqrt( 2/(n-1) ) * exp( gammaln( n/2 ) - gammaln((n - 1)/2) )

so for n=32 => c4=0,9920, A3=0,5346, B3=0,6175 B4 = 1,3825

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