NAME

       cfetoolcheck - Check a new value against the averages currently in the database

SYNOPSIS

       cfetool check name --value⎪-V value [--path⎪-p directory name] [--time⎪-t seconds]
       [--daily⎪-d] [--weekly⎪-w] [--yearly⎪-y] [--histograms⎪-H] [--verbose⎪-v] [--help⎪-h]

DESCRIPTION

       Takes a new value and checks it against the averages currently in the database specified
       by name, located at the path specified by the -p argument, or the current working
       directory if the -p argument is omitted.  The value will be associated with the current
       time, unless the -t option is given. The output indicates how much higher or lower the new
       value is compared to the averages in the database, in terms of the number of standard
       deviations.

       The -d, -w and -y options specify the databases to check the new value against. If all
       three options are omitted, only the weekly database will be accessed.

OPTIONS

       --value⎪-v value
           Specifies the new value to check against the database averages.

       --path⎪-p directory name
           The directory in which the database specified by name can be found.

       --time⎪-t
           The time the value was collected, in seconds since epoch (January 1st, 1970).  If this
           argument is omitted, the current time will be used.

       --daily⎪-d
           Check the new value against the daily averages database.

       --weekly⎪-w
           Check the new value against the weekly averages database.

       --yearly⎪-y
           Check the new value against the yearly averages database.

       --histograms⎪-H
           Check which histogram bucket the new value would fall into.  The histogram is divided
           into 64 buckets, which represent distances from the mean value. Bucket 64 represents
           two standard deviations above the expected value, and bucket 0 represents two standard
           deviations below the expected value.

       --verbose⎪-v
           Print details of the command's execution to the standard output stream.

       --help⎪-h
           Print a short help message and then exit.

OUTPUT

       Before exiting, "cfetool check" will print one line to the standard output stream, in the
       following format:

       yrly=ynum,bkt=ybkt;wkly=wnum,bkt=wbkt;dly=dnum,bkt=dbkt

       ybkt, wbkt and dbkt represent the histogram bucket the given value falls into, and will be
       0 for databases that are not being checked against, and if there is no histogram file or
       the -H option was not specified.

       ynum, wnum and dnum will be either the number 0 if the corresponding database was not
       updated, or a code indicating the state of the given statistic, as compared to an average
       of equivalent earlier times, as specified below:

        code    high⎪low⎪normal   meaning
        -------------------------------------------------------------
         -2     -                 no sigma variation
        -------------------------------------------------------------
         -4     low               within noise threshold, and within
         -5     normal              2 standard deviations from
         -6     high                expected value
        -------------------------------------------------------------
        -14     low               microanomaly: within noise
        -15     normal              threshold, but 2 or more standard
        -16     high                deviations from expected value
        -------------------------------------------------------------
        -24     low               normal; within 1 standard deviation
        -25     normal              from the expected value
        -26     high
        -------------------------------------------------------------
        -34     low               dev1; more than 1 standard
        -35     normal              deviation from the expected
        -36     high                value
        ------------------------------------------------------------
        -44     low               dev2; more than 2 standard
        -45     normal              deviations from the expected
        -46     high                value
        -------------------------------------------------------------
        -54     low               anomaly; more than 3 standard
        -55     normal              deviations from the expected
        -56     high                value

       Where "low" indicates that the current value is below both the expected value for the
       current time position, and the global average value. "high" indicates that the current
       value is above those values. "normal" indicates that the current value is within the range
       of expected values.

       "cfetool check" also exits with a code corresponding to the above table. If more than one
       database is being checked against, the most negative result from all checks is returned,
       and the individual results must be obtained from the standard output stream, as described
       above.

EXAMPLE

         % cfetool check temperature --path /my/path --value 20 --histograms
         yrly=0,bkt=0;wkly=-6,bkt=51;dly=0,bkt=0

       Checks the value 20 against the weekly temperature database and histogram files located in
       /my/path/ using the current time. The output indicates that the new value given was within
       cfetool's noise threshold, and also within 2 standard deviations of the previous average
       stored in the weekly database.

AUTHORS

       The code and documentation were contributed by Stanford Linear Accelerator Center, a
       department of Stanford University.  This documentation was written by

       Elizabeth Cassell <e_a_c@mailsnare.net> and
       Alf Wachsmann <alfw@slac.stanford.edu>

COPYRIGHT AND DISCLAIMER

        Copyright 2004 Alf Wachsmann <alfw@slac.stanford.edu> and
                       Elizabeth Cassell <e_a_c@mailsnare.net>
        All rights reserved.