DIFFERENCE OF COEFFICENT OF VARIATION

DIFFERENCE OF COEFFICENT OF VARIATION (LET)

Let Subcommand

Compute the difference between the coefficient of variation for two response variables.

The coefficient of variation is the standard deviation divided by the mean.

For the difference of the coefficient of variation, the coefficient of variation is computed for each of two samples then their difference is taken.

LET <par> = DIFFERENCE OF COEFFICENT OF VARIATION <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 coefficient of variation is stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET A = DIFFERENCE OF COEFFICENT OF VARIATION Y1 Y2
LET A = DIFFERENCE OF COEFFICENT OF VARIATION Y1 Y2 SUBSET X > 1

Dataplot statistics can be used in a number of commands. For details, enter
HELP STATISTICS

None

None

COEFFICENT OF VARIATION	= Compute the coefficient of variation.
RELATIVE SD	= Compute the relative sd.
MEAN	= Compute the mean.
SD	= Compute the standard deviation.
DIFFERENCE OF RELATIVE SD	= Compute the difference of the relative sd.
STATISTICS PLOT	= Generate a statistic versus subset plot.
BOOTSTRAP PLOT	= Generate a bootstrap plot.
TABULATE	= Perform a tabulation for a specified statistic.

Data Analysis

2003/03

SKIP 25 
READ IRIS.DAT Y1 TO Y4 X 
. 
LET A = DIFFERENCE OF COEFFICENT OF VARIATION Y1 Y2 
TABULATE DIFFERENCE OF COEFFICENT OF VARIATION Y1 Y2 X 
. 
XTIC OFFSET 0.2 0.2 
X1LABEL GROUP ID 
Y1LABEL DIFFERENCE OF COEFFICENT OF VARIATION 
CHAR X 
LINE BLANK 
DIFFERENCE OF COEFFICENT OF VARIATION PLOT Y1 Y2 X 
CHAR X ALL 
LINE BLANK ALL 
BOOTSTRAP DIFFERENCE OF COEFFICENT OF VARIATION PLOT Y1 Y2 X  
    

Dataplot generated the following output.

       ************************************************************
       **  LET A = DIFFERENCE OF COEFFICIENT OF VARIATION Y1 Y2  **
       ************************************************************
  
  
 THE COMPUTED VALUE OF THE CONSTANT A             = -0.85294247E-03
  
  
       ***************************************************************
       **  TABULATE DIFFERENCE OF COEFFICIENT OF VARIATION Y1 Y2 X  **
       ***************************************************************
  
  
                 *    Y1       AND Y2
     X           *    DIFFERENCE OF COEFFICIENT OF V
 **********************************************
     1.00000     *   -0.401654E-01
     2.00000     *   -0.263285E-01
     3.00000     *   -0.119178E-01
  
       GROUP-ID AND STATISTIC WRITTEN TO FILE DPST1F.DAT