ROUND_EXACT: Stata module to perform exact decimal rounding using integer transformation to bypass floating-point noise

Anne Fengyan Shi ()
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Anne Fengyan Shi: Pew Research Center

Statistical Software Components from Boston College Department of Economics

Abstract: round_exact addresses the common issue of floating-point precision errors in Stata's built-in round(x, unit) function. Standard rounding often leaves "noise" in binary representation (e.g., round(0.3, 0.1) resulting in 0.30000000000000004), which causes logical assertions to fail. This command implements the formula: round(val * 10**d) / 10**d. By transforming the value into an integer before rounding, it avoids the precision errors introduced by fractional units.

Language: Stata
Requires: Stata version 14
Keywords: data management; rounding (search for similar items in EconPapers)
Date: 2026-04-06
Note: This module should be installed from within Stata by typing "ssc install round_exact". The module is made available under terms of the MIT license (https://opensource.org/licenses/MIT).
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http://fmwww.bc.edu/repec/bocode/r/round_exact.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/r/round_exact.sthlp help file (text/plain)

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