Reviewed by: jrtc27 Differential Revision: https://reviews.freebsd.org/D33724 MFC after: 2 weeks
140 lines
5.0 KiB
Groff
140 lines
5.0 KiB
Groff
.\"
|
|
.\" Copyright (c) 2007 Poul-Henning Kamp
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd November 10, 2012
|
|
.Dt MINISTAT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ministat
|
|
.Nd statistics utility
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl Anqs
|
|
.Op Fl C Ar column
|
|
.Op Fl c Ar confidence_level
|
|
.Op Fl d Ar delimiter
|
|
.Op Fl w Op width
|
|
.Op Ar
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
command calculates fundamental statistical properties of numeric data
|
|
in the specified files or, if no file is specified, standard input.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width Fl
|
|
.It Fl A
|
|
Just report the statistics of the input and relative comparisons,
|
|
suppress the ASCII-art plot.
|
|
.It Fl n
|
|
Just report the raw statistics of the input, suppress the ASCII-art plot
|
|
and the relative comparisons.
|
|
.It Fl q
|
|
Suppress printing of summary statistics and data-set names; typically for use
|
|
alongside
|
|
.Fl n .
|
|
.It Fl s
|
|
Print the average/median/stddev bars on separate lines in the ASCII-art
|
|
plot, to avoid overlap.
|
|
.It Fl C Ar column
|
|
Specify which column of data to use.
|
|
By default the first column in the input file(s) are used.
|
|
.It Fl c Ar confidence_level
|
|
Specify desired confidence level for Student's T analysis.
|
|
Possible values are 80, 90, 95, 98, 99 and 99.5 %
|
|
.It Fl d Ar delimiter
|
|
Specifies the column delimiter characters, default is SPACE and TAB.
|
|
See
|
|
.Xr strtok 3
|
|
for details.
|
|
.It Fl w Ar width
|
|
Width of ASCII-art plot in characters.
|
|
The default is the terminal width, or 74 if standard output is not a
|
|
terminal.
|
|
.El
|
|
.Pp
|
|
A sample output could look like this:
|
|
.Bd -literal -offset indent
|
|
$ 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
|
|
.Ed
|
|
.Pp
|
|
If
|
|
.Nm
|
|
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.
|
|
.Pp
|
|
You have the option of lowering your standards by specifying a
|
|
lower confidence level:
|
|
.Bd -literal -offset indent
|
|
$ 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)
|
|
.Ed
|
|
.Pp
|
|
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.
|
|
.Sh SEE ALSO
|
|
Any mathematics text on basic statistics, for instances Larry Gonicks
|
|
excellent "Cartoon Guide to Statistics" which supplied the above example.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command was written by Poul-Henning Kamp out of frustration
|
|
over all the bogus benchmark claims made by people with no
|
|
understanding of the importance of uncertainty and statistics.
|
|
.Pp
|
|
From
|
|
.Fx 5.2
|
|
it has lived in the source tree as a developer tool, graduating
|
|
to the installed system from
|
|
.Fx 8.0 .
|