Dataplot

Vol 1

Auxiliary Chapter

GEOMETRIC STANDARD DEVIATION

GEOMETRIC STANDARD DEVIATION (LET)

Let Subcommand

Compute the geometric standard deviation for a variable.

The geometric standard deviation is defined as:

where sd is the sample standard deviation.

LET <par> = GEOMETRIC STANDARD DEVIATION <y1>
                        <SUBSET/EXCEPT/FOR qualification>
where <y1> is the response variable;
            <par> is a parameter where the computed geometric standard deviation is stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET A = GEOMETRIC STANDARD DEVIATION Y1
LET A = GEOMETRIC STANDARD DEVIATION Y1 SUBSET TAG > 2

Support for the geometric standard deviation has been added to the following plots:
GEOMETRIC STANDARD DEVIATION PLOT
BOOTSTRAP GEOMETRIC STANDARD DEVIATION PLOT
JACKNIFE GEOMETRIC STANDARD DEVIATION PLOT
CROSS TABULATE GEOMETRIC STANDARD DEVIATION PLOT
INTERACTION GEOMETRIC STANDARD DEVIATION PLOT
INFLUENCE GEOMETRIC STANDARD DEVIATION CURVE
TABULATE GEOMETRIC STANDARD DEVIATION
CROSS TABULATE GEOMETRIC STANDARD DEVIATION
LET ... = CROSS TABULATE GEOMETRIC STANDARD DEVIATION

None

GEOMETRIC SD is a synonym for GEOMETRIC STANDARD DEVIATION.

STANDARD DEVIATION	= Compute the standard deviation.
MAD	= Compute the median absolute deviation.
GEOMETRIC MEAN	= Compute the geometric mean.
STATISTIC PLOT	= Generate a statistic vs. subset plot.
BOOTSTRAP PLOT	= Generate a bootstrap plot.
JACKNIFE PLOT	= Generate a jacknife plot.
CROSS TABULATE PLOT	= Generate a cross tabulate plot.
INTERACTION PLOT	= Generate an interaction plot.

Data Analysis

2000/1

LET Y1 = NORMAL RANDOM NUMBERS FOR I = 1 1 100
LET A1 = GEOMETRIC STANDARD DEVIATION Y1