DIFFERENCE OF MIDRANGE

DIFFERENCE OF MIDRANGE (LET)

Let Subcommand

Compute the difference between the midranges for two response variables.

The midrange is the mean of the minimum and maximum points (i.e., (min + max)/2) of a response variable.

For the differeence of midranges, the midrange is computed for each of two samples then their difference is taken.

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

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

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

None

None

MIDRANGE	= Compute the midrange.
RANGE	= Compute the range.
MINIMUM	= Compute the minimum.
MAXIMUM	= Compute the maximum.
QUANTILE	= Compute a quantile.
MEAN	= Compute the mean.
STANDARD DEVIATION	= Compute the standard deviation.
DIFFERENCE OF RANGE	= Compute the difference of the ranges.
DIFFERENCE OF MEAN	= Compute the difference of the means.
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 MIDRANGE Y1 Y2 
TABULATE DIFFERENCE OF MIDRANGE Y1 Y2 X 
. 
XTIC OFFSET 0.2 0.2 
X1LABEL GROUP ID 
Y1LABEL DIFFERENCE OF MIDRANGE 
CHAR X 
LINE BLANK 
DIFFERENCE OF MIDRANGE PLOT Y1 Y2 X 
CHAR X ALL 
LINE BLANK ALL 
BOOTSTRAP DIFFERENCE OF MIDRANGE PLOT Y1 Y2 X  
    

Dataplot generated the following output.

       ********************************************
       **  LET A = DIFFERENCE OF MIDRANGE Y1 Y2  **
       ********************************************
  
  
 THE COMPUTED VALUE OF THE CONSTANT A             =  0.29000003E+01
  
  
       ***********************************************
       **  TABULATE DIFFERENCE OF MIDRANGE Y1 Y2 X  **
       ***********************************************
  
  
                 *    Y1       AND Y2
     X           *    DIFFERENCE OF MIDRANGES
 **********************************************
     1.00000     *     1.70000
     2.00000     *     3.25000
     3.00000     *     3.40000
  
       GROUP-ID AND STATISTIC WRITTEN TO FILE DPST1F.DAT