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NEWCOMBE11: Stata module to compute eleven confidence intervals for the difference between two independent binomial proportions

Author

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  • Silvano Andorno

    (University of Eastern Piedmont "Amedeo Avogadro")

Programming Language

Abstract

newcombe11 calculates confidence intervals for the risk difference, p1 - p2, between two independent binomial proportions, using the eleven methods numbered in Newcombe (1998). The default is method 10, the combination of uncorrected Wilson score intervals, with 95% confidence. In immediate syntax, group 1 is x1/n1. In dataset syntax, group 1 is the smaller observed numeric value of group; group 2 is the larger value. Observations with missing outcome or group are excluded. Changing group coding can reverse the sign of the difference. The output explicitly identifies the numeric code of each group and displays its value label, if defined. The difference always subtracts the larger-coded group's proportion from the smaller-coded group's proportion. Labels do not change this order. In immediate syntax, the two groups follow the supplied argument order.

Suggested Citation

  • Silvano Andorno, 2026. "NEWCOMBE11: Stata module to compute eleven confidence intervals for the difference between two independent binomial proportions," Statistical Software Components S460002, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s460002
    Note: This module should be installed from within Stata by typing "ssc install newcombe11". The module is made available under terms of the MIT license (https://opensource.org/licenses/MIT).
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    File URL: http://fmwww.bc.edu/repec/bocode/n/newcombe11.ado
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    File URL: http://fmwww.bc.edu/repec/bocode/n/newcombe11.sthlp
    File Function: help file
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