DIFFERENCE OF EXTREME

DIFFERENCE OF EXTREME (LET)

Let Subcommand

Compute the difference between the extremes for two response variables.

The extreme is the maximum of the absolute value of the smallest and largest value of a response variable.

For the difference of extremes, the extreme is computed for each of two samples then their difference is taken.

LET <par> = DIFFERENCE OF EXTREME <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 extreme is stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET A = DIFFERENCE OF EXTREME Y1 Y2
LET A = DIFFERENCE OF EXTREME Y1 Y2 SUBSET X > 1

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

None

None

EXTREME	= Compute the extreme.
MEAN	= Compute the mean.
MINIMUM	= Compute the minimum.
MAXIMUM	= Compute the maximum.
QUANTILE	= Compute a quantile.
STANDARD DEVIATION	= Compute the standard deviation.
DIFFERENCE OF MINIMUM	= Compute the difference of the minimums.
DIFFERENCE OF MAXIMUM	= Compute the difference of the maximums.
DIFFERENCE OF SD	= Compute the difference of standard deviations.
DIFFERENCE OF QUANTILE	= Compute the difference of a quantile.
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 EXTREME Y1 Y2 
TABULATE DIFFERENCE OF EXTREME Y1 Y2 X 
. 
XTIC OFFSET 0.2 0.2 
X1LABEL GROUP ID 
Y1LABEL DIFFERENCE OF EXTREME 
CHAR X 
LINE BLANK 
DIFFERENCE OF EXTREME PLOT Y1 Y2 X 
CHAR X ALL 
LINE BLANK ALL 
BOOTSTRAP DIFFERENCE OF EXTREME PLOT Y1 Y2 X  
    

Dataplot generated the following output.

       *******************************************
       **  LET A = DIFFERENCE OF EXTREME Y1 Y2  **
       *******************************************
  
  
 THE COMPUTED VALUE OF THE CONSTANT A             =  0.35000000E+01
  
  
       **********************************************
       **  TABULATE DIFFERENCE OF EXTREME Y1 Y2 X  **
       **********************************************
  
  
                 *    Y1       AND Y2
     X           *    DIFFERENCE OF EXTREMES
 **********************************************
     1.00000     *     1.40000
     2.00000     *     3.60000
     3.00000     *     4.10000
  
       GROUP-ID AND STATISTIC WRITTEN TO FILE DPST1F.DAT