
REPEATABILITY STANDARD DEVIATIONName:
This document describes repeatability in the following way.
The repeatability standard deviation for a single material is computed as
with p and s_{i} denoting the number of laboratories and the standard deviation of the ith laboratory, respectively. In an interlaboratory study, the repeatability standard deviation is computed for each material.
<SUBSET/EXCEPT/FOR qualification> where <y> is a response variable; <labid> is a labid variable; <par> is a parameter where the repeatability sd value is saved; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET RSD = REPEATABILITY STAND DEVI Y LAB SUBSET MAT = 1
The repeatability standard deviation can be plotted for multiple materials with the command
SKIP 25 READ GLUCOSE.DAT Y LABID MATID . LET MATDIST = DISTINCT MATID LET NMAT = SIZE MATDIST XLIMITS 1 NMAT MAJOR XTIC MARK NUMBER NMAT MINOR XTIC MARK NUMBER 0 XTIC OFFSET 0.5 0.5 Y1LABEL REPEATABILITY SD X1LABEL MATERIAL LINE BLANK CHARACTER X . REPEATABILITY SD PLOT Y LABID MATID
 
Privacy
Policy/Security Notice
NIST is an agency of the U.S. Commerce Department.
Date created: 4/20/2005 