.:HSTuners::::Hondas Wanted:: |
09-13-2005, 04:21 PM
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#1 |
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Yahoo Watashi wa kattaze!
Join Date: May 2002
Location: Meanwhile, up in The D...
Age: 40
Posts: 10,579
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Standard Deviation
Does anyone understand SD well enough to explain how the hell I use it?
IE) I have a mean of 100 (baseline) and need to find the control limits for the graph in +-2 with an SD of 4. # #--------------------------------------------NEED 102 101 100-----------------BASE------------------ 99 98 #--------------------------------------------NEED # Last edited by pdiggitydogg : 09-13-2005 at 04:40 PM. |
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09-13-2005, 04:31 PM
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#2 |
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Registered User
Join Date: Sep 2003
Location: Des Moines IA
Age: 38
Posts: 7,908
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93 Si H23vtec......soon to be 12lbs 95 Civic EX....automatic DD if you cant dazzle them with your brillance, baffle them with your bullshit. |
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09-13-2005, 06:18 PM
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#3 |
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Banning Machine
Join Date: Aug 2001
Location: My Garage, Va.
Posts: 5,547
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fuk if I know bro. Steve will probably figure it out.... or BDC
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09-13-2005, 06:25 PM
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#4 |
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Registered User
Join Date: Mar 2004
Location: the nasti nati
Age: 38
Posts: 130
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ehhh pain in the ass work. im clueless too
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09-13-2005, 06:59 PM
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#5 |
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Thought Police
Join Date: Aug 2001
Location: orlando florida
Age: 40
Posts: 9,662
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actually....i know it kinda. im actually studying some shit for econometrics and aggregate analysis right not involving that, i'll see if i can write something that makes sence sometime tonight
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Black Vtec Prelude-h22a power'd  Many dreams come true, and some have silver linings. I live for my dreams and a pocket full of gold. |
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09-13-2005, 07:38 PM
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#6 |
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Moderator
Join Date: Feb 2002
Location: Az
Age: 43
Posts: 3,804
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they way i just learned is that the control limits are either set by the instructor or are +/- 2.66times(average of the moving ranges) and "moving range" being the absolute value of the difference between two consecutive data points plotted in the trend chart.
then there's some other control limits that are for ideal cases(which i think is yours)that are +/- (#ofS.D.'s), which i think is what you need. so put all your data in an excel spread sheet make it tell you the standard deviation and I think your control limits would be +/-(4 times whatever# excel gives you). i could be wrong but i dont think i am. |
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09-13-2005, 09:20 PM
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#7 | |
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Best...mod...ever
Join Date: Sep 2001
Location: At the end of the longest line
Age: 42
Posts: 7,451
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Quote:
Haha. I appreciate the vote of confidence Arnel, but I'll be fucked if I can do any sort of math that's even remotely complicated.
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1984 1/2 Mustang GT350 #842, Faster than you...nuff said Anna Fan Club President/Dictator Someday, in the event that mankind actually figures out what it is that this world actually revoles around, thousands of people are going to be shocked and perplexed that it was not them. Sometimes this includes me. "If you want a vision of the future, imagine a boot stamping on a human face - forever." - George Orwell Welcome to the new Amerika |
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09-13-2005, 09:22 PM
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#8 |
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Yahoo Watashi wa kattaze!
Join Date: May 2002
Location: Meanwhile, up in The D...
Age: 40
Posts: 10,579
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Got it!
SD x (the + value) --> + the mean (4 x 2 = 8 + 100 = 108,92) |
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09-13-2005, 11:00 PM
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#9 |
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Moderator
Join Date: Feb 2002
Location: Az
Age: 43
Posts: 3,804
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oh the standard deviation IS 4, i thought you had to find control points for a 4sigma(S.D.) system. never mind
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09-14-2005, 07:59 AM
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#10 |
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Thought Police
Join Date: Aug 2001
Location: orlando florida
Age: 40
Posts: 9,662
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yeah im doing something a bit different with SD.. i wouldnt have been able to help too much.
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Black Vtec Prelude-h22a power'd Many dreams come true, and some have silver linings. I live for my dreams and a pocket full of gold. |
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