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ISO 13528 ZPRIME SCOREName:
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with Xref,
Determing an assigned value and its associated uncertainty is
discussed on pages 5-10 of the standard. Determining a value
for
Since there are a mumber of different methods for determining
Xref, uXref, and
The ISO 13528 standard recommends that z'-scores with an absolute value greater than 3 should be considered an "action signal" and those with an absolute value greater than 2 should be considered a "warning signal".
<SUBSET/EXCEPT/FOR qualification> where <x> is the response variable; <xref> is a parameter that defines the assigned value; <sigma> is a parameter that defines the assigned value; <uref> is a parameter that defines the standard uncertainty of the assigned value; <y> is a variable where the z-score values are stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
. Note: this example is just meant to demostrate the . mechanics of the command. This is not in fact . proficiency data, but it can be used to demonstrate . how to use the command. . skip 25 read gear.dat y x . let xref = 1. let sigma = sd y let uref = 0.001 . let yz = iso 13528 zprime score y xref sigma uref . set write decimals 3 print x y yzThe following output is generated. --------------------------------------------- X Y YZ --------------------------------------------- 1.000 1.006 0.943 1.000 0.996 -0.629 1.000 0.998 -0.314 1.000 1.000 0.000 1.000 0.992 -1.258 1.000 0.993 -1.100 1.000 1.002 0.314 1.000 0.999 -0.157 1.000 0.994 -0.943 1.000 1.000 0.000 2.000 0.998 -0.314 2.000 1.006 0.943 2.000 1.000 0.000 2.000 1.002 0.314 2.000 0.997 -0.471 2.000 0.998 -0.314 2.000 0.996 -0.629 2.000 1.000 0.000 2.000 1.006 0.943 2.000 0.988 -1.887 3.000 0.991 -1.415 3.000 0.987 -2.044 3.000 0.997 -0.471 3.000 0.999 -0.157 3.000 0.995 -0.786 3.000 0.994 -0.943 3.000 1.000 0.000 3.000 0.999 -0.157 3.000 0.996 -0.629 3.000 0.996 -0.629 4.000 1.004 0.786 4.000 1.002 0.314 4.000 0.994 -0.943 4.000 1.000 0.000 4.000 0.995 -0.786 4.000 0.994 -0.943 4.000 0.998 -0.314 4.000 0.996 -0.629 4.000 1.002 0.314 4.000 0.996 -0.629 5.000 0.998 -0.314 5.000 0.998 -0.314 5.000 0.982 -2.831 5.000 0.990 -1.572 5.000 1.002 0.314 5.000 0.984 -2.516 5.000 0.996 -0.629 5.000 0.993 -1.100 5.000 0.980 -3.145 5.000 0.996 -0.629 6.000 1.008 1.415 6.000 1.012 2.044 6.000 1.008 1.415 6.000 0.997 -0.471 6.000 0.988 -1.887 6.000 1.002 0.314 6.000 0.995 -0.786 6.000 0.998 -0.314 6.000 0.981 -2.988 6.000 0.996 -0.629 7.000 0.990 -1.572 7.000 1.004 0.629 7.000 0.996 -0.629 7.000 1.000 0.157 7.000 0.998 -0.314 7.000 1.000 0.000 7.000 1.018 2.831 7.000 1.010 1.572 7.000 0.996 -0.629 7.000 1.002 0.314 8.000 0.998 -0.314 8.000 1.000 0.000 8.000 1.006 0.943 8.000 1.000 0.000 8.000 1.002 0.314 8.000 0.996 -0.629 8.000 0.998 -0.314 8.000 0.996 -0.629 8.000 1.002 0.314 8.000 1.006 0.943 9.000 1.002 0.314 9.000 0.998 -0.314 9.000 0.996 -0.629 9.000 0.995 -0.786 9.000 0.996 -0.629 9.000 1.004 0.629 9.000 1.004 0.629 9.000 0.998 -0.314 9.000 0.999 -0.157 9.000 0.991 -1.415 10.000 0.991 -1.415 10.000 0.995 -0.786 10.000 0.984 -2.516 10.000 0.994 -0.943 10.000 0.997 -0.471 10.000 0.997 -0.471 10.000 0.991 -1.415 10.000 0.998 -0.314 10.000 1.004 0.629 10.000 0.997 -0.471
Date created: 01/27/2012 |