 Dataplot Vol 2 Vol 1

# DIFFERENCE OF SUM

Name:
DIFFERENCE OF SUM (LET)
Type:
Let Subcommand
Purpose:
Compute the difference between the sums for two response variables.
Syntax:
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.
Examples:
LET A = DIFFERENCE OF SUM Y1 Y2
LET A = DIFFERENCE OF SUM Y1 Y2 SUBSET X > 1
Note:
Dataplot statistics can be used in a number of commands. For details, enter

Default:
None
Synonyms:
None
Related Commands:
 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.
Applications:
Data Analysis
Implementation Date:
2003/03
Program:
```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
``` NIST is an agency of the U.S. Commerce Department.

Date created: 03/27/2003
Last updated: 11/12/2015