K CONSISTENCY STATISTIC

K CONSISTENCY STATISTIC (LET)

Let Subcommand

Compute the k-consistency statistic of a variable as defined by the ASTM E 691 - 99 standard.

The k-consistency statistic is defined in the ASTM E 691 - 99 standard as
k = s/s_r (within laboratory consistency statistic)

with

s = cell standard deviation
s_r = repeatability standard deviation

LET <k> = K CONSISTENCY STATISTIC <y> <labid>
            <SUBSET/EXCEPT/FOR qualification>
where <y> is a response variable;
            <labid> is a lab-id variable;
            <k> is a variable where the k-consistency statistic values are saved; and where the <SUBSET/EXCEPT/FOR qualification> is optional.

This syntax is used to compute the k-consistency statistic for a single material. The number of k-values is equal to the number of laboratories.

LET <k> = K CONSISTENCY STATISTIC <y> <labid> <matid>
            <SUBSET/EXCEPT/FOR qualification>
where <y> is a response variable;
            <labid> is a lab-id variable;
            <matid> is a material-id variable;
            <k> is a variable where the k-consistency statistic values are saved;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

This syntax is used to compute the k-consistency statistic for multiple materials. The number of k-values is equal to the number of materials times the number of laboratories.

LET A = K CONSISTENCY STATISTIC Y LAB
LET HVAL = K CONSISTENCY STATISTIC Y LAB MAT
LET HVAL = K CONSISTENCY STATISTIC Y LAB MAT SUBSET MAT > 2

None

None

E691 INTERLAB	= Perform an E691 interlab analysis.
H CONSISTENCY STATISTIC	= Compute the h-consistency statistic.

"Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method", ASTM International, 100 Barr Harbor Drive, PO BOX C700, West Conshohoceken, PA 19428-2959, USA.

Interlaboratory Analysis

2005/4

 
SKIP 25
READ GLUCOSE.DAT Y MATID LABID
.
LET KVAL = K CONSISTENCY STATISTIC Y LABID MATID