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31 .Nd statistics utility
36 .Op Fl c Ar confidence_level
43 command calculates fundamental statistical properties of numeric data
44 in the specified files or, if no file is specified, standard input.
46 The options are as follows:
49 Just report the statistics of the input and relative comparisons,
50 suppress the ASCII-art plot.
52 Just report the raw statistics of the input, suppress the ASCII-art plot
53 and the relative comparisons.
55 Suppress printing of summary statistics and data-set names; typically for use
59 Print the average/median/stddev bars on separate lines in the ASCII-art
60 plot, to avoid overlap.
62 Specify which column of data to use.
63 By default the first column in the input file(s) are used.
64 .It Fl c Ar confidence_level
65 Specify desired confidence level for Student's T analysis.
66 Possible values are 80, 90, 95, 98, 99 and 99.5 %
68 Specifies the column delimiter characters, default is SPACE and TAB.
73 Width of ASCII-art plot in characters.
74 The default is the terminal width, or 74 if standard output is not a
78 A sample output could look like this:
79 .Bd -literal -offset indent
80 $ ministat -s -w 60 iguana chameleon
83 +------------------------------------------------------------+
85 | |________M______A_______________| |
86 | |________________M__A___________________| |
87 +------------------------------------------------------------+
88 N Min Max Median Avg Stddev
89 x 7 50 750 200 300 238.04761
90 + 5 150 930 500 540 299.08193
91 No difference proven at 95.0% confidence
96 tells you, as in the example above, that there is no difference
97 proven at 95% confidence, the two data sets you gave it are for
98 all statistical purposes identical.
100 You have the option of lowering your standards by specifying a
101 lower confidence level:
102 .Bd -literal -offset indent
103 $ ministat -s -w 60 -c 80 iguana chameleon
106 +------------------------------------------------------------+
108 | |________M______A_______________| |
109 | |________________M__A___________________| |
110 +------------------------------------------------------------+
111 N Min Max Median Avg Stddev
112 x 7 50 750 200 300 238.04761
113 + 5 150 930 500 540 299.08193
114 Difference at 80.0% confidence
117 (Student's t, pooled s = 264.159)
120 But a lower standard does not make your data any better, and the
121 example is only included here to show the format of the output when
122 a statistical difference is proven according to Student's T method.
124 Any mathematics text on basic statistics, for instances Larry Gonicks
125 excellent "Cartoon Guide to Statistics" which supplied the above example.
129 command was written by Poul-Henning Kamp out of frustration
130 over all the bogus benchmark claims made by people with no
131 understanding of the importance of uncertainty and statistics.
135 it has lived in the source tree as a developer tool, graduating
136 to the installed system from