ministat - Online in the Cloud

PROGRAM:

NAME

ministat — statistics utility

SYNOPSIS

ministat [-Ans] [-C column] [-c confidence_level] [-d delimiter] [-w [width]] [file ...]

DESCRIPTION

The ministat command calculates fundamental statistical properties of numeric data in the
specified files or, if no file is specified, standard input.

The options are as follows:

-A Just report the statistics of the input and relative comparisons, suppress the
ASCII-art plot.

-n Just report the raw statistics of the input, suppress the ASCII-art plot and the
relative comparisons.

-s Print the average/median/stddev bars on separate lines in the ASCII-art plot, to
avoid overlap.

-C column Specify which column of data to use. By default the first column in the input
file(s) are used.

-c confidence_level
Specify desired confidence level for Student's T analysis. Possible values are
80, 90, 95, 98, 99 and 99.5 %

-d delimiter
Specifies the column delimiter characters, default is SPACE and TAB. See
strtok(3) for details.

-w width Width of ASCII-art plot in characters. The default is the terminal width, or 74
if standard output is not a terminal.

A sample output could look like this:

$ ministat -s -w 60 iguana chameleon
x iguana
+ chameleon
+------------------------------------------------------------+
|x * x * + + x +|
| |________M______A_______________| |
| |________________M__A___________________| |
+------------------------------------------------------------+
N Min Max Median Avg Stddev
x 7 50 750 200 300 238.04761
+ 5 150 930 500 540 299.08193
No difference proven at 95.0% confidence

If ministat tells you, as in the example above, that there is no difference proven at 95%
confidence, the two data sets you gave it are for all statistical purposes identical.

You have the option of lowering your standards by specifying a lower confidence level:

$ ministat -s -w 60 -c 80 iguana chameleon
x iguana
+ chameleon
+------------------------------------------------------------+
|x * x * + + x +|
| |________M______A_______________| |
| |________________M__A___________________| |
+------------------------------------------------------------+
N Min Max Median Avg Stddev
x 7 50 750 200 300 238.04761
+ 5 150 930 500 540 299.08193
Difference at 80.0% confidence
240 +/- 212.215
80% +/- 70.7384%
(Student's t, pooled s = 264.159)

But a lower standard does not make your data any better, and the example is only included
here to show the format of the output when a statistical difference is proven according to
Student's T method.

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