Dataplot

Vol 2

Vol 1

GEOMETRIC STANDARD DEVIATION

GEOMETRIC STANDARD DEVIATION (LET)

Let Subcommand

Compute the geometric standard deviation for a variable.

The geometric standard deviation is defined as:
\( GSD = e^{sd(\log{X_i})} \)

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

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

None

GEOMETRIC SD is a synonym for GEOMETRIC STANDARD DEVIATION.

STANDARD DEVIATION	= Compute the standard deviation.
MEDIAN ABSOLUTE DEVIATION	= Compute the median absolute deviation.
GEOMETRIC MEAN	= Compute the geometric mean.
STATISTICS PLOT	= Generate a statistic versus subset plot.
BOOTSTRAP PLOT	= Generate a bootstrap plot.
TABULATE	= Perform a tabulation for a specified statistic.

Data Analysis

2000/01

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