ST1GX Process

To access this process:

Sample Analysis ribbon >> Statistics >> Statistics Processes >> Sturgess Rule Statistics.
View the Find Command screen, select ST1GX and click Run.
Enter "ST1GX" into the Command Line and press <ENTER>.

See this process in the Command Table.

Process Overview

Calculates general summary statistics for a single field, in log or non-log mode with or without class selection using Sturgess' Rule.

The calculated statistics include:-

total number of records in the file.
number of values used for statistical analysis.
number of missing values.
minimum, maximum, range, total and mean.
variance, standard deviation and standard error.
skewness and kurtosis.
coefficient of variation.
mean plus 2 and mean plus 4 standard deviations.
median.
mode.

These results are displayed in the Output control bar, and can be copied to the printer or printfile. A list of BIN sizes with BIN counts and percentage frequency for each class, cumulative frequency, class interval and number of BINS are also calculated. In addition, printer plots on a normal probability scale are calculated and can be sent to the printer or printfile.

The first bin in the histogram plot contains all values up to MINIMUM. The last bin contains all values above the top value. If LOGMODE is set to 1, antilogs are automatically calculated.

Values of skewness and kurtosis calculated are interpreted as:

SKEWNESS	= 0. No distortion (Gaussian).
	> 0. Positive skew (to the right).
	< 0. Negative skew (to the left).
KURTOSIS	= 0. Mesokurtic (Gaussian).
	> 0. Leptokurtic (peaked).
	< 0. Platikurtic (flat).

Input Files

Name	Description	I/O Status	Required	Type
IN	Input file.	Input	Yes	Table

Fields

Name	Description	Source	Required	Type	Default
VALUE	Field for statistics.	IN	Yes	Numeric	Undefined

Parameters

Name

Description

Required

Default

Range

Values

BINSIZE

Bin width for histogram [computed].

Undefined

MINIMUM

Minimum bin limit [computed].

Undefined

STURGESS

Option	Description
1	class interval [bin width] and minimum class value [bin limit] are calculated according to the following equation: Class interval = 1 + 3.3 log N [Sturgess Rule] and values within each bin are placed at the mid-point of each class (0).

0,1

LOGMODE

Option	Description
1	log transformation [base 10] is calculated (0).

0,1

PERC

Option	Description
0	numeric bin count for histogram; >0 percentage bin count for histogram (0).

Undefined

Example

Copy

!ST1GX    &IN(SEDREG),*VALUE(CU),@LOGMODE=1,@STURGESS=1

Error and Warning Messages

Message	Description
>>> ERR 121 <<< ( fileno) IN STATS1	File read error. Fatal; the process is exited. Check the range of values of the *VALUE field in the &IN file.
NO MODES DETECTED - CHECK CLASS INTERVAL	Error computing statistics (e.g. empty file). Fatal; the process is exited. Check the range of values of the *VALUE field in the &IN file.