tstdvar.1 - numtools - perform numerical operations on vectors and matrices in unix pipes
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       tstdvar.1 (1320B)
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            1 .Dd $Mdocdate$
            2 .Dt STDVAR 1
            3 .Os
            4 .Sh NAME
            5 .Nm stdvar
            6 .Nd returns the standard variance for each input column
            7 .Sh SYNOPSIS
            8 .Nm
            9 .Op Fl d Ar delimstr
           10 .Op Fl n
           11 .Op Fl p Ar prec
           12 .Op Fl u
           13 .Sh DESCRIPTION
           14 .Nm
           15 returns the corrected sample standard variance (s²) for each column
           16 of standard input.
           17 Input fields must be tab-separated and each line most contain the same
           18 number of fields.
           19 The output is always in full double precision.
           20 .Pp
           21 The options are as follows:
           22 .Bl -tag -width Ds
           23 .It Fl d Ar delimstr
           24 Separate output values by
           25 .Ar delimstr .
           26 The default delimiter is tab characters.
           27 .It Fl n
           28 Do not print a newline after the final value.
           29 .It Fl p Ar prec
           30 Print the output values with
           31 .Ar prec
           32 digits of precision.
           33 By default, the output is printed with 17 digits of precision, which is
           34 full double precision on 64-bit systems.
           35 .It Fl u
           36 Return the uncorrected sample standard deviation instead.
           37 .El
           38 .Sh EXAMPLES
           39 Compute the corrected standard variance for some input numbers:
           40 .Dl $ printf '10\en8\en10\en8\en8\en4\en' | stdvar
           41 .Dl 4.7999999999999998
           42 .Pp
           43 Same as the previous example, but return the uncorrected standard
           44 variance:
           45 .Dl $ printf '10\en8\en10\en8\en8\en4\en' | stdvar -u
           46 .Dl 4
           47 .Sh SEE ALSO
           48 .Xr max 1 ,
           49 .Xr mean 1 ,
           50 .Xr min 1 ,
           51 .Xr stddev 1 ,
           52 .Xr sum 1
           53 .Sh AUTHORS
           54 .An Anders Damsgaard Aq Mt anders@adamsgaard.dk