Contents

.TH Stddev
.PP
Standard deviation
.SH Signature
.PP
.RS
.nf
stddev(expr: AttrName|(Tuple\->Numeric)) \-> Aggregator
.fi
.RE
.SH Examples
.PP
.RS
.nf
stddev(:qty)
.fi
.RE
.PP
.RS
.nf
stddev{|t| t.qty * t.price }
.fi
.RE
.PP
.RS
.nf
stddev(\->(t){ t.qty * t.price })
.fi
.RE
.SH Description
.PP
Computes how much variation from the average exists.
.SH Implementation notes
.PP
This aggregate function should only be used with numeric types. As of
current Alf version, it does not aggregate empty sets correctly on
non\-numeric data types.

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
alf-shell-0.16.3	doc/man/stddev.man
alf-shell-0.16.2	doc/man/stddev.man
alf-shell-0.16.1	doc/man/stddev.man