Type: Package
Package: missalpha
Title: Find Range of Cronbach Alpha with a Dataset Including Missing
        Data
Version: 0.2.0
Authors@R: c(
    person("Feng", "Ji", email = "f.ji@utoronto.ca", role = c("aut")),
    person("Biying", "Zhou", email = "biying.zhou@psu.edu", role = c("aut","cre")))
Maintainer: Biying Zhou <biying.zhou@psu.edu>
Description: Provides functions to calculate the minimum and maximum
        possible values of Cronbach's alpha when item-level missing
        data are present. Cronbach's alpha (Cronbach, 1951
        <doi:10.1007/BF02310555>) is one of the most widely used
        measures of internal consistency in the social, behavioral, and
        medical sciences (Bland & Altman, 1997
        <doi:10.1136/bmj.314.7080.572>; Tavakol & Dennick, 2011
        <doi:10.5116/ijme.4dfb.8dfd>). However, conventional
        implementations assume complete data, and listwise deletion is
        often applied when missingness occurs, which can lead to biased
        or overly optimistic reliability estimates (Enders, 2003
        <doi:10.1037/1082-989X.8.3.322>). This package implements
        computational strategies including enumeration, Monte Carlo
        sampling, and optimization algorithms (e.g., Genetic Algorithm,
        Differential Evolution, Sequential Least Squares Programming)
        to obtain sharp lower and upper bounds of Cronbach's alpha
        under arbitrary missing data patterns. The approach is
        motivated by Manski's partial identification framework and
        pessimistic bounding ideas from optimization literature.
License: MIT + file LICENSE
Depends: R (>= 3.1.0),
Imports: GA, DEoptim, nloptr, stats,
Encoding: UTF-8
RoxygenNote: 7.3.3
Suggests: testthat (>= 3.0.0)
Config/testthat/edition: 3
LazyData: true
NeedsCompilation: no
Packaged: 2026-09-23 07:01:37 UTC; root
Author: Feng Ji [aut], Biying Zhou [aut, cre]
Repository: https://cran.r-universe.dev
Date/Publication: 2025-10-29 15:39:48 UTC
RemoteUrl: https://github.com/cran/missalpha
RemoteRef: HEAD
RemoteSha: 02d76680e8ff0b0ce98326dc3aee39013308fb58
Built: R 4.6.0; ; 2026-09-23 07:04:05 UTC; unix
