Online Acceptance Sampling Calculators other than "sqconline"

U

unueco

#1
Greetings:

I'd like to gather pointers to or recommendations for an online acceptance sampling calculator that is *NOT* "sqconline".

They used to be my standard "go to" web site when I needed to put together a mil-std 105E sampling plan. But recently it seems they have become more and more restrictive of what you can do without paying for the service....and I don't do this enough for it to be cost effective to subcribe.

Any recommendations?

Thank you!!
 
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Bev D

Heretical Statistician
Leader
Super Moderator
#2
I don't use the on-line calculators. I use a spreadsheet that Tim Folkerts posted here some time ago. I've modified it some to add features I use regularly. There is a tab for determining a plan based on the AQL and RQL levels, a tab for simple c=0 for RQLs (Which could be easily modified for AQL only plans - I haven't done it because we don't use AQL only...). There is a tab for comparing the OC curves for multiple plans as well as a tab for the binomial and poisson distributions for a given defect rate and sample size that is great for understanding the fundamentals...

One thing that distinguishes this spreadsheet from calssical calcualtors is that the plans are unrelated to lot size. It's statistically more correct than the 'old fashioned' AQL tables but some auditors and Quality folks get confused by this as it isn't what they are used to.

My thanks to Tim for the core of this spreadsheet.
 

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U

unueco

#3
Thank you for your response. Sorry its taken me so long to get back to you. Your advice is much appreciated!
 
B

berry

#4
Newbie here :)
On the spreadsheet: If the sample size is 25
Can you kindly explain ...
Accept on 6 = c
Reject on 3
Are you rejecting the 7th, 8th and 9th part? or the 4th, 5th, 6th part?
 
U

unueco

#5
Hi!

I'm sorry but those parameters do not seem to make sense to me.

Normally, in a single pass acceptance plan, your acceptance parameter is:

Accept = C; Rej = C+1

So if it is Acc=6;Rej = 7 this means that if you find 6 or fewer failed pieces in your sample, then you accept the entire lot. If you find 7 failed pieces, then you reject the entire lot.

There is a particular sub-category of acceptance plans called C=0 plans. These plans are designed such that if even just one piece in the sample fails, the entire lot is rejected.

Hope this helps you understand.

Cheers!
 
B

berry

#6
The information I copied is from the spreadsheet in the thread above.
It was a bit confusing. If I put into sample size as 25 I get the info above. I was not sure what the 3 was as a rej if the ac = 6

Thanks for the assistance. :applause:
 

Bev D

Heretical Statistician
Leader
Super Moderator
#7
if you only entered 25 as a sample size and didn't change the AQL/RQL and confidence levels, the spreadsheet did give you a warning that you needed to increase your sample size and that the plan was not acceptable.

the spreadsheet works by increasing or decreasing the sample size until that sample size will meet your stated AQL and Confidence level for the AQL and the RQL and it's confidence level. the requirement for convergence is that the reject number (r) =c+1 where c is the accept number.

As often happens, you probably have a larger question than just the one you asked?
 
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