
DIFFERENCE OF BIWEIGHT LOCATIONName:
where
\( w_{i} = 0 \hspace{0.5in} \mbox{otherwise} \) and \( S = \mbox{median}\{y_{i}  y*\} \) c = 6 (using 6 means that residuals up to approximately \( 4 \sigma \) are included) Note that this is an iterative estimate since y* depends on w_{i} and w_{i} depends on y*.
Dataplot will compute up to 10 iterations (computation is terminated if the biweight location estimate does not change in value by more than 0.000001). For the differeence of biweight locations, the biweight location is computed for each of two samples then their difference is taken.
<y1> <y2> <SUBSET/EXCEPT/FOR qualification> where <y1> is the first response variable; <y2> is the first response variable; <par> is a parameter where the computed difference of the biweight locations is stored; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
LET A = DIFFERENCE OF BIWEIGHT LOCATION Y1 Y2 SUBSET X > 1
SKIP 25 READ IRIS.DAT Y1 TO Y4 X . LET A = DIFFERENCE OF BIWEIGHT LOCATION Y1 Y2 TABULATE DIFFERENCE OF BIWEIGHT LOCATION Y1 Y2 X . XTIC OFFSET 0.2 0.2 X1LABEL GROUP ID Y1LABEL DIFFERENCE OF BIWEIGHT LOCATIONS CHAR X LINE BLANK DIFFERENCE OF BIWEIGHT LOCATION PLOT Y1 Y2 X CHAR X ALL LINE BLANK ALL BOOTSTRAP DIFFERENCE OF BIWEIGHT LOCATION PLOT Y1 Y2 XThe following output is generated. ***************************************************** ** LET A = DIFFERENCE OF BIWEIGHT LOCATION Y1 Y2 ** ***************************************************** THE COMPUTED VALUE OF THE CONSTANT A = 0.27841682E+01 ******************************************************** ** TABULATE DIFFERENCE OF BIWEIGHT LOCATION Y1 Y2 X ** ******************************************************** * Y1 AND Y2 X * DIFFERENCE OF BIWEIGHT LOCATION ********************************************** 1.00000 * 1.57608 2.00000 * 3.14232 3.00000 * 3.60915 GROUPID AND STATISTIC WRITTEN TO FILE DPST1F.DAT
 
Privacy
Policy/Security Notice
NIST is an agency of the U.S. Commerce Department.
Date created: 03/21/2003 