UNIQUEVALUES—Extracts an ordered set of unique values

[TomDoan]

This procedure returns a vector of sorted unique values for an input series over an indicated range.

uniquevalues.src

Procedure file

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@UniqueValues(values=VECTOR,other options) series start end

Options

values=VECTOR of values found in the series [required]
smpl=dummy with 0's in entries to skip [not used]

The following shows it in use. The data set (from Greene's Econometric Analysis) is an unbalanced panel, with individuals indexed by the "ID" series. UniqueValues generates a sorted list of the individuals into the VECTOR named VID.

Code: Select all

open data rwm.txt
data(format=free,org=columns) 1 27326 id female year age hsat handdum $
 handper hhninc hhkids educ married haupts reals fachhs abitur univ $
 working bluec whitec self beamt docvis hospvis public addon
@uniquevalues(values=vid) id