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Dataplot Vol 2 Vol 1

DIFFERENCE OF SD OF THE MEAN

Name:
    DIFFERENCE OF SD OF THE MEAN (LET)
Type:
    Let Subcommand
Purpose:
    Compute the difference between the standard deviation of the means for two response variables.
Description:
    The standard deviation of the mean is:

      \( s_{mean} = \frac{s}{\sqrt{n}} \)

    with s and n denoting the standard deviation and the number of observations, respectively.

    For the differeence of standard deviation of the means, the standard deviation of the mean is computed for each of two samples then their difference is taken.

Syntax:
    LET <par> = DIFFERENCE OF SD OF THE MEAN <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 sd of the means is stored;
    and where the <SUBSET/EXCEPT/FOR qualification> is optional.
Examples:
    LET A = DIFFERENCE OF SD OF THE MEAN Y1 Y2
    LET A = DIFFERENCE OF SD OF THE MEAN Y1 Y2 SUBSET X > 1
Note:
    Dataplot statistics can be used in a number of commands. For details, enter

Default:
    None
Synonyms:
    DIFFERENCE OF STANDARD DEVIATION OF THE MEAN is synonym for DIFFERENCE OF SD OF THE MEAN.
Related Commands: Applications:
    Data Analysis
Implementation Date:
    2003/03
Program:
    SKIP 25 
    READ IRIS.DAT Y1 TO Y4 X 
    . 
    LET A = DIFFERENCE OF SD OF THE MEAN Y1 Y2 
    TABULATE DIFFERENCE OF SD OF THE MEAN Y1 Y2 X 
    . 
    XTIC OFFSET 0.2 0.2 
    X1LABEL GROUP ID 
    Y1LABEL DIFFERENCE OF SD OF THE MEAN 
    CHAR X 
    LINE BLANK 
    DIFFERENCE OF SD OF THE MEAN PLOT Y1 Y2 X 
    CHAR X ALL 
    LINE BLANK ALL 
    BOOTSTRAP DIFFERENCE OF SD OF THE MEAN PLOT Y1 Y2 X  
        
    Dataplot generated the following output.
           **************************************************
           **  LET A = DIFFERENCE OF SD OF THE MEAN Y1 Y2  **
           **************************************************
      
      
     THE COMPUTED VALUE OF THE CONSTANT A             =  0.32022983E-01
      
      
           *****************************************************
           **  TABULATE DIFFERENCE OF SD OF THE MEAN Y1 Y2 X  **
           *****************************************************
      
      
                     *    Y1       AND Y2
         X           *    DIFFERENCE OF SD OF THE MEAN
     **********************************************
         1.00000     *   -0.375823E-02
         2.00000     *    0.286198E-01
         3.00000     *    0.443190E-01
      
           GROUP-ID AND STATISTIC WRITTEN TO FILE DPST1F.DAT
        
    plot generated by sample program

    plot generated by sample program

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

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