Glossary of Symbols
Anand M. Joglekar · 2003
A 2 Factor in constructing X ෆ chart (3/d 2 ͙n ෆ) A 3 Factor in constructing X ෆ chart (3/c 4 ͙n ෆ) a, b, c Number of levels of factors ␣ In testing hypotheses, risk of rejecting the null hypotheses when true: also, level of significance B 3 Factor in constructing S chart (1 -3͙1 ෆ -ෆ c ෆ 4 2 ෆ/c 4 ) B 4 Factor in constructing S chart (1 + 3͙1 ෆ -ෆ c ෆ 4 2 ෆ/c 4 ) b Intercept in linear regression  In testing hypotheses, risk of accepting the null hypotheses when false, power of a test = 1 - C 4 Factor in constructing S chart [4(n -1)/(4n -3)] C p Capability index [(USL -LSL)/6 short ] C pk Capability index [smaller of (USL --- x)/3 short or ( -- x -LSL)/3 short ] CV Coefficient of variation (=RSD = /) c Number of defects per product c ෆ Average number of defects per product 2 Chi-square distribution 2 ␣,n-1 The ␣ point of a chi-square distribution with (n -1) degrees of freedom D 3 Factor used to construct R chart (1 -3d 3 /d 2 ) D 4 Factor used to construct R chart (1 + 3d 3 /d 2 ) d Used in calculating sample size (⌬/) Glossary of Symbols 313 Statistical Methods for Six Sigma by Anand M.