DIFFERENCE OF SUM

DIFFERENCE OF SUM (LET)

Let Subcommand

Compute the difference between the sums for two response variables.

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

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

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

None

None

SUM	= Compute the sum.
PRODUCT	= Compute the product.
CUMULATIVE SUM	= Compute the cumulative sum.
MEAN	= Compute the mean.
STANDARD DEVIATION	= Compute the standard deviation.
DIFFERENCE OF MEAN	= Compute the difference of the means.
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 SUM Y1 Y2 
TABULATE DIFFERENCE OF SUM Y1 Y2 X 
. 
XTIC OFFSET 0.2 0.2 
X1LABEL GROUP ID 
Y1LABEL DIFFERENCE OF SUM 
CHAR X 
LINE BLANK 
DIFFERENCE OF SUM PLOT Y1 Y2 X 
CHAR X ALL 
LINE BLANK ALL 
BOOTSTRAP DIFFERENCE OF SUM PLOT Y1 Y2 X  
    

Dataplot generated the following output.

       ***************************************
       **  LET A = DIFFERENCE OF SUM Y1 Y2  **
       ***************************************
  
  
 THE COMPUTED VALUE OF THE CONSTANT A             =  0.41789999E+03
  
  
       ******************************************
       **  TABULATE DIFFERENCE OF SUM Y1 Y2 X  **
       ******************************************
  
  
                 *    Y1       AND Y2
     X           *    DIFFERENCE OF SUM
 **********************************************
     1.00000     *     78.9000
     2.00000     *     158.300
     3.00000     *     180.700
  
       GROUP-ID AND STATISTIC WRITTEN TO FILE DPST1F.DAT