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diff --git a/usr.bin/ministat/chameleon b/usr.bin/ministat/chameleon
--- a/usr.bin/ministat/chameleon
+++ b/usr.bin/ministat/chameleon
@@ -1,5 +1,5 @@
150
400
-720
+720
500
930
diff --git a/usr.bin/ministat/ministat.1 b/usr.bin/ministat/ministat.1
--- a/usr.bin/ministat/ministat.1
+++ b/usr.bin/ministat/ministat.1
@@ -1,6 +1,7 @@
.\"
-.\" Copyright (c) 2007 Poul-Henning Kamp
-.\" All rights reserved.
+.\" Copyright (c) 2007 Poul-Henning Kamp. All rights reserved.
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
@@ -23,7 +24,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd November 10, 2012
+.Dd November 13, 2025
.Dt MINISTAT 1
.Os
.Sh NAME
@@ -33,9 +34,9 @@
.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 Fl c Ar confidence
+.Op Fl d Ar delimiters
+.Op Fl w Ar width
.Op Ar
.Sh DESCRIPTION
The
@@ -44,10 +45,26 @@
in the specified files or, if no file is specified, standard input.
.Pp
The options are as follows:
-.Bl -tag -width Fl
+.Bl -tag -width "-c confidence"
.It Fl A
Just report the statistics of the input and relative comparisons,
suppress the ASCII-art plot.
+.It Fl C Ar column
+Specify which column of data to use.
+By default the first column in the input file(s) is used.
+.It Fl c Ar confidence
+Specify desired confidence level for Student's T analysis.
+Possible percent values are
+.Cm 80 , 90 , 95 , 98 , 99 ,
+and
+.Cm 99.5 .
+.It Fl d Ar delimiters
+Specify the column delimiter characters, default is
+.Ql \ \et
+.Pq i.e., a space and a tab .
+See
+.Xr strtok 3
+for details.
.It Fl n
Just report the raw statistics of the input, suppress the ASCII-art plot
and the relative comparisons.
@@ -58,75 +75,104 @@
.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.
+Set the width of the ASCII-art plot in characters.
The default is the terminal width, or 74 if standard output is not a
terminal.
.El
.Pp
+.Nm
+accepts up to seven input files.
+.Pp
+Each dataset must contain at least three values.
+.Sh EXIT STATUS
+.Ex -std
+.Sh EXAMPLES
+Let's consider two input files.
+The first one will be
+.Dq iguana :
+.Bd -literal -offset indent
+50
+200
+150
+400
+750
+400
+150
+.Ed
+.Pp
+The second one will be
+.Dq chameleon :
+.Bd -literal -offset indent
+150
+400
+720
+500
+930
+.Ed
+.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
+$ 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
+proven at 95% confidence, the two datasets 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)
+$ 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.
+Any mathematics text on basic statistics, for instance the following book,
+which supplied the above example:
+.Rs
+.%A Larry Gonick
+.%A Woollcott Smith
+.%B The Cartoon Guide to Statistics
+.%D 1993
+.%I HarperPerennial
+.%O ISBN 0-06-273102-5
+.Re
.Sh HISTORY
The
.Nm
-command was written by Poul-Henning Kamp out of frustration
+command was written by
+.An 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
diff --git a/usr.bin/ministat/ministat.c b/usr.bin/ministat/ministat.c
--- a/usr.bin/ministat/ministat.c
+++ b/usr.bin/ministat/ministat.c
@@ -530,7 +530,7 @@
fprintf(stderr, "%s\n", whine);
fprintf(stderr,
- "Usage: ministat [-C column] [-c confidence] [-d delimiter(s)] [-Anqs] [-w width] [file [file ...]]\n");
+ "Usage: ministat [-Anqs] [-C column] [-c confidence] [-d delimiter(s)] [-w width] [file ...]]\n");
fprintf(stderr, "\tconfidence = {");
for (i = 0; i < NCONF; i++) {
fprintf(stderr, "%s%g%%",

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