KEYBY: Stata module to key the dataset by a variable list

Roger Benedict Newson ()

Statistical Software Components from Boston College Department of Economics

Abstract: keyby sorts the dataset currently in memory by the variables in a varlist, checking that the variables in the varlist uniquely identify the observations. This makes the variables in the varlist a primary key for the dataset in memory. If the user does not specify otherwise, then keyby also reorders the variables in the varlist to the start of the variable order in the dataset, and checks that all values of these variables are nonmissing. keyby can be useful if the user combines multiple datasets using merge, which may cause a dataset in memory to become unsorted.

Language: Stata
Requires: Stata version 10.0
Keywords: data manipulation; sort; key (search for similar items in EconPapers)
Date: 2007-08-31
Note: This module may be installed from within Stata by typing "ssc install keyby". Windows users should not attempt to download these files with a web browser.

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/k/keyby.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/k/keyby.sthlp help file (text/plain)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Ordering information: This software item can be ordered from
http://repec.org/docs/ssc.php

Access Statistics for this software item

More software in Statistical Software Components from Boston College Department of Economics
Address: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA
Contact information at EDIRC.
Series data maintained by Christopher F Baum ().