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OUTLIER(1) User Commands OUTLIER(1) NAME outlier - find outlier limits from numeric input SYNOPSIS outlier [options] [file] DESCRIPTION This command reads from input files, or stdin when file argument is omitted, numeric input and does statistics analysis to the values. Output put has is printed to each input file separately, and it con‐ tains lof (low fench), q1 (first quartile), mean, q1 (third quartile), hif (high fench), range how much values differ, and samples that tells how many data points the calculation got as an input. The output is same as what is basis of a traditional boxplot. OPTIONS -m, --min value Minimum allowed value. When lof is calculated to be smaller the minimum value is printed instead. -x, --max value Maximum allowed value. When hif is calculated to be greater the maximum value is printed instead. -r, --rrdxml Read rrd archive database row values from rrdtool dump xml out‐ put. -w, --whiskers multiplier Multiply interquartile range by a floating point number, to set lof and hif to be closer (multiplier < 1.0) or further (1.0 < multplier). The default multiplier is 1.5. If the dump has in definition for min and/or max data set values they are used as a minimum and maximum printout values for lof and hif when the calculated value is out of range. When multiplier is set to zero printing (and related computation) of lof, hif and range is omitted. -V, --version Display version information and exit. -h, --help Display help and exit. EXAMPLE Dump rrd a file, filter output to contain only measurement values, and analyze. rrdtool dump file.rrd | outlier --rrdxml cat lots_of_numbers | outlier outlier input_file_1 input_file_2 NOTES This command was originally wrote to assist finding reasonable alarming thresholds from rrd files. The lof and hif can be considered as a rea‐ sonable guess when a measurement exceeds limit of begin normal, and an alarm should be sent. SEE ALSO rrdtool(1), ⟨http://en.wikipedia.org/wiki/Box_plot⟩ AVAILABILITY The outlier command can be found from github ⟨https://github.com/ kerolasa/outlier/⟩. outlier 1.0 OUTLIER(1)
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