VALIDLY: Stata module to correct Stata’s handling of missing values in logical and relational expressions

Kenneth Macdonald ()
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Kenneth Macdonald: Nuffield College, Oxford University

Statistical Software Components from Boston College Department of Economics

Abstract: Think of "validly" as a modifier which corrects errors in certain commands. Stata handles missing values intelligently within algebraic operations (so the sum of, say, 4 and an unknown number, is correctly deemed to be unknown). This intelligence does not extend to logical and relational operations. The conjunction of two unknown values is, for example, deemed by Stata to be a known true statement. There are workarounds (which have to be more complex than they are usually presented as being) but they make life unnecessarily difficult when analysing real data. To remedy this, validly generate has the functionality of generate, but, in contrast to Stata's generate, behaves appropriately when missing values are encountered within logical or relational expressions. Likewise validly replace, validly assert, validly global, validly reg... if ...(works for any other conditional command).

Language: Stata
Requires: Stata version 10
Keywords: conditional; missing values; logical expressions (search for similar items in EconPapers)
Date: 2013-08-10
Note: This module should be installed from within Stata by typing "ssc install validly". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/v/validly.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/v/validly.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/v/vy.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/v/vy.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/v/validate_validly.do sample code file (text/plain)

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