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File name : SR17E-E.doc
Date: 2003/10/8 Trimmed Size : 140 x 75 mm SCALE 1 : 1
-E29-
CPK ( [CPK] )
Minimum (CPU, CPL) of the x values, where
CPU is upper spec. limit of capability
precision and CPL is lower spec. limit of
capability precision
CPK = Min ( CPU , CPL ) = CP ( 1 – Ca )
Paired-variable statistics / Regression calculations
Variables Meaning
n ( [ n ] ) Number of x-y pairs entered
x
( [2nd]+[
x
] )
y
( [2nd]+[
y
] )
Mean of the x values or y values
Sx ( [2nd]+[ Sx ] )
Sy ( [2nd]+[ Sy ] )
Sample standard deviation of x values or y
values
σ
x ( [2nd]+[
σ
x ] )
σ
y ( [2nd]+[
σ
y ] )
Population standard deviation of x values or
y values
¦
x ( [2nd]+[
¦
x ] )
¦
y ( [2nd]+[
¦
y ] )
Sum of all x values or y values
¦
x
2
( [2nd]+[
¦
x
2
])
¦
y
2
( [2nd]+[
¦
y
2
])
Sum of all x
2
values or y
2
values
¦
x y Sum of ( x • y ) for all x-y pairs
CP ( [2nd]+[ CP ] ) Potential capability precision of the x values
CPK ( [ CPK ] )
Minimum (CPU, CPL) of the x values, where
CPU is upper spec. limit of capability
precision and CPL is lower spec. limit of
capability precision
CPK = Min ( CPU , CPL ) = CP ( 1 – Ca )
a ( [2nd]+[ a ] ) Regression formula constant term a
b ( [2nd]+[ b ] ) Regression formula regression coefficient b
r ( [2nd]+[ r ] ) Correlation coefficient r
x ([ x ] ) Estimated value of x
y ([ y ] ) Estimated value of y
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