SixSigma Chart
1
4 The Greek symbol “Sigma” which means standard deviation; a measure of variation As Sigma ( , s) gets smaller the error in predicting the result gets smaller = Standard Deviation A statistical measure of a process’s ability to meet customer requirements (CTQs) Process Six Sigma equates to 3.4 defects per million opportunities or a Cpk =2 = Measure of Process Capability Standard Deviation and Process Capability Yield DPMO Sigma 69.2% 308,000 2 93.3% 66,800 3 99.4% 6,210 4 99.977% 230 5 99.99966% 3.4 6 Yield DPMO Sigma Cpk = ~1.33 Cpk = 2 Six Sigma Methodologies Overview -6 -3 -2 -1 x +1 +2 +3 +6 Sigma Percent +/-1 sigma 68.27 +/-2 sigma 95.45 +/-3 sigma 99.73
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SixSigma Chart
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4
Ø The Greek symbol “Sigma” which means standard deviation; a measure of variation
Ø As Sigma (s, s) gets smaller the error in predicting the result gets smaller
s = Standard Deviation
Ø A statistical measure of a process’s ability to meet customer requirements (CTQs)
Ø Process Six Sigma equates to 3.4 defects per million opportunities or a Cpk =2
s = Measure of Process
Capability
Standard Deviation and Process Capability
Yield DPMO Sigma
69.2% 308,000 2
93.3% 66,800 3
99.4% 6,210 4
99.977% 230 5
99.99966% 3.4 6
Yield DPMO Sigma
Cpk = ~1.33
Cpk = 2
Six Sigma Methodologies Overview
-6s -3s -2s -1s x +1s +2s +3s +6s
Sigma Percent
+/-1 sigma 68.27
+/-2 sigma 95.45
+/-3 sigma 99.73
