序號 | 日期 | 時間 | 觀測值 X1 X2 ......... Xn | X | R |
1 2 k | X11 X12 ......... X1n X21 X22 ......... X2n Xk1 Xk2 ......... Xkn | X1 X2 Xk | s1 s2 sk |
製程平均及標準差已知 未知 .
UCLX = μX + 3σX = μ + 3σ/(n)-2 ≈ Xbar + A3sCLX = μX = μ ≈ Xbar
LCLX = μX - 3σX = μ - 3σ/(n)-2 ≈ Xbar - A3s
UCLS = μS + 3σS = c4σ + 3c5σ ≈ B4s
UCLS = μS = C4σ ≈ s
LCLS = μS - 3σS = c4σ - 3c5σ ≈ B3s(小於零時不計)
A3 =
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