CITIZEN SR-281 EN - Manual (Page 29)

File name : SR17E-E.doc
Date: 2003/10/8 Trimmed Size : 140 x 75 mm SCALE 1 : 1
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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
σx ( [2nd]+[ σx ] )
σy ( [2nd]+[ σy ] ) 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