MINISTAT(1) BSD General Commands Manual MINISTAT(1)[top]NAMEministat— statistics utilitySYNOPSISministat[] [-nscolumn] [-Cconfidence_level] [-cdelimiter] [-d[width]] [file ...]-wDESCRIPTIONTheministatcommand calculates fundamental statistical properties of numeric data in the specified files or, if no file is specified, standard input. The options are as follows:Just report the raw statistics of the input, suppress the ASCII-art plot and the relative comparisons.-nPrint the average/median/stddev bars on separate lines in the ASCII-art plot, to avoid overlap.-scolumn Specify which column of data to use. By default the first column in the input file(s) are used.-Cconfidence_level Specify desired confidence level for Student's T analysis. Possible values are 80, 90, 95, 98, 99 and 99.5 %-cdelimiter Specifies the column delimiter characters, default is SPACE and TAB. See strtok(3) for details.-dwidth Width of ASCII-art plot in characters, default is 74. A sample output could look like this: $-wministat-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-sministattells you, as in the example above, that there is no differ‐ ence 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 con‐ fidence level: $ministat80 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.-cSEE ALSOAny mathematics text on basic statistics, for instances Larry Gonicks excellent "Cartoon Guide to Statistics" which supplied the above example.HISTORYTheministatcommand 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. From FreeBSD 5.2 it has lived in the source tree as a developer tool, graduating to the installed system from FreeBSD 8.0.BSDDecember 20, 2007 BSD

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