1.\" 2.\" Copyright (c) 2007 Poul-Henning Kamp 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd November 10, 2012 29.Dt MINISTAT 1 30.Os 31.Sh NAME 32.Nm ministat 33.Nd statistics utility 34.Sh SYNOPSIS 35.Nm 36.Op Fl Ans 37.Op Fl C Ar column 38.Op Fl c Ar confidence_level 39.Op Fl d Ar delimiter 40.Op Fl w Op width 41.Op Ar 42.Sh DESCRIPTION 43The 44.Nm 45command calculates fundamental statistical properties of numeric data 46in the specified files or, if no file is specified, standard input. 47.Pp 48The options are as follows: 49.Bl -tag -width Fl 50.It Fl A 51Just report the statistics of the input and relative comparisons, 52suppress the ASCII-art plot. 53.It Fl n 54Just report the raw statistics of the input, suppress the ASCII-art plot 55and the relative comparisons. 56.It Fl s 57Print the average/median/stddev bars on separate lines in the ASCII-art 58plot, to avoid overlap. 59.It Fl C Ar column 60Specify which column of data to use. 61By default the first column in the input file(s) are used. 62.It Fl c Ar confidence_level 63Specify desired confidence level for Student's T analysis. 64Possible values are 80, 90, 95, 98, 99 and 99.5 % 65.It Fl d Ar delimiter 66Specifies the column delimiter characters, default is SPACE and TAB. 67See 68.Xr strtok 3 69for details. 70.It Fl w Ar width 71Width of ASCII-art plot in characters, default is 74. 72.El 73.Pp 74A sample output could look like this: 75.Bd -literal -offset indent 76 $ ministat -s -w 60 iguana chameleon 77 x iguana 78 + chameleon 79 +------------------------------------------------------------+ 80 |x * x * + + x +| 81 | |________M______A_______________| | 82 | |________________M__A___________________| | 83 +------------------------------------------------------------+ 84 N Min Max Median Avg Stddev 85 x 7 50 750 200 300 238.04761 86 + 5 150 930 500 540 299.08193 87 No difference proven at 95.0% confidence 88.Ed 89.Pp 90If 91.Nm 92tells you, as in the example above, that there is no difference 93proven at 95% confidence, the two data sets you gave it are for 94all statistical purposes identical. 95.Pp 96You have the option of lowering your standards by specifying a 97lower confidence level: 98.Bd -literal -offset indent 99 $ ministat -s -w 60 -c 80 iguana chameleon 100 x iguana 101 + chameleon 102 +------------------------------------------------------------+ 103 |x * x * + + x +| 104 | |________M______A_______________| | 105 | |________________M__A___________________| | 106 +------------------------------------------------------------+ 107 N Min Max Median Avg Stddev 108 x 7 50 750 200 300 238.04761 109 + 5 150 930 500 540 299.08193 110 Difference at 80.0% confidence 111 240 +/- 212.215 112 80% +/- 70.7384% 113 (Student's t, pooled s = 264.159) 114.Ed 115.Pp 116But a lower standard does not make your data any better, and the 117example is only included here to show the format of the output when 118a statistical difference is proven according to Student's T method. 119.Sh SEE ALSO 120Any mathematics text on basic statistics, for instances Larry Gonicks 121excellent "Cartoon Guide to Statistics" which supplied the above example. 122.Sh HISTORY 123The 124.Nm 125command was written by Poul-Henning Kamp out of frustration 126over all the bogus benchmark claims made by people with no 127understanding of the importance of uncertainty and statistics. 128.Pp 129From 130.Fx 5.2 131it has lived in the source tree as a developer tool, graduating 132to the installed system from 133.Fx 8.0 . 134