on 06-01-2011 9:40 AM
Hi Friends,
How Upper action limit, Upper Warning Limit, Lower warning Limit, Lower Action Limit is calculated from MEAN (centerline) ?
Thanks
check following links
this may help you
http://books.google.co.in/books?id=jsLg5EIagcEC&pg=PA55&lpg=PA55&dq=Upperactionlimit,UpperWarning+Limit,&source=bl&ots=nv4hFc_mOa&sig=j3-Rr9A8EKjCNEBMkgouNyDvypQ&hl=mr&ei=8A7mTeKlGYu-vgOksLDjCg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCMQ6AEwAg#v=onepage&q=Upper%20action%20limit%2C%20Upper%20Warning%20Limit%2C&f=false
http://www.cimt.plymouth.ac.uk/projects/mepres/alevel/fstats_ch8.pdf
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
Hi,
Theoretical ok.
I need to know in SAP the following values entered in the Define control charts is used for calculation ?
Numeric parameters
Parameter1 0.995000 Distribution function at the upper action limit
Parameter2 0.975000 Distribution function at the upper warning limit
Parameter3 0.025000 Distribution function at the lower warning limit
Parameter4 0.005000 Distribution function at the lower action limit
I gues you have the mean value * std deviation ready with you. So try thye following formula:
UWL = mean+2u03C3/u221An
LWL = mean-2u03C3/u221An
UAL = mean+3u03C3/u221An
LAL = mean-3u03C3/u221An
u03C3 is std. deviation and n no of samples
See if these formulas return the same value as is being shown in SAP. Or you can go through the following book [http://books.google.co.in/books?id=JLm1r6rUAdcC&pg=PA109&lpg=PA109&dq=whatisupperactionlimit&source=bl&ots=I-Z4c7AQfg&sig=Bftjs8FWzngpPamlTOFQ0issF1o&hl=en&ei=cLDoTdWKMoy0rAfi-Jx9&sa=X&oi=book_result&ct=result&resnum=6&ved=0CDgQ6AEwBQ#v=onepage&q=what%20is%20upper%20action%20limit&f=false].
SAP uses usual formulas for calculation, nothing extra. So any statistician or good mathematician will be able to make you understand the limit calculations.
User | Count |
---|---|
89 | |
7 | |
6 | |
3 | |
3 | |
3 | |
3 | |
3 | |
3 | |
2 |
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.