MSA bias calculation in 3rd edition - Why is d2/d2star used?

S

Stevenli

#1
Dear all,

For bias in MSA 3rd edition, I have one question as following.
When calculate the 1-α confident interval (CI), there is one formula:

Bias+/-[d2σb(tv,1-α/2)/d2star]

The question is why d2/d2star is used, because when I check the traditional t distribute CI formula, there is no such kind of parameter.

Your attention would be highly appreciated.
Best regards
Steven
 
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#3
It's a weekend. Many of our regular Covers take the weekend off and will return Monday. I'm sure some of the statistics whizzes will have an interesting answer.
 
J

jinzhoujun

#4
Why not use T-test to test the bias in AIAG MSA

hi
in AIAG MSA , use d2 and d2* to calculate the range of bias ,rather than use T-test to test the bias
thanks
 
Last edited by a moderator:
A

Atul Khandekar

#5
Stevenli said:
For bias in MSA 3rd edition, I have one question as following.
When calculate the 1-α confident interval (CI), there is one formula:

Bias+/-[d2σb(tv,1-α/2)/d2star]

The question is why d2/d2star is used, because when I check the traditional t distribute CI formula, there is no such kind of parameter.
jinzhoujun said:
hi
in AIAG MSA , use d2 and d2* to calculate the range of bias ,rather than use T-test to test the bias
thanks
My knowledge of statistics is rather limited so I won't be able to explain this esoteric stuff well. From whatever I've tried to research on the subject, here are a few links that MAY help.

From AIAG: StatExpose_d2.pdf

From Quality Engineering, Vol 13, No 2:
A Note on Using Ranges to Estimate Variability - by Woodall/Montgomery.
Moderator Note:
[Dead Link Removed]
This can now be purchased from: http://asq.org/qic/display-item/index.html?item=14637



From iSixSigma Discussion forum: Bias Calculation

and

http://elsmar.com/Forums/showthread.php?t=7178
 
J

jinzhoujun

#6
almost two years passed, we have no anwser,I think we did better put forwards this to AIAG, maybe it is mistake ,as i know they made mistake in other place,they mistake “g” for “ mg”.
 
J

jinzhoujun

#7
Atul Khandekar ,thank you for your offer , I get answer now, in fact ,this is my question, I ask steven Li put forward it
 
G

Gagandeep S. Datta

#8
I wanted to check on the statement - "as i know they made mistake in other place,they mistake ?g? for ? mg?.?

Is it that they mistake "g" for "m"?
 
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