Direction-Aware Sufficiency Condition Analysis R package SCAtools version 0.4.3 Provides a direction-aware interface for analysing bivariate sufficiency statements from empty-space frontier patterns. Logical sufficiency directions (high or low levels of a condition and outcome) are kept separate from the physical location of the empty corner in the scatter plot. Computation is delegated to version 5 of the 'NCA' package based on Dul (2016) <doi:10.1177/1094428115584005>, using the contraposition between necessity and sufficiency. Threshold tables are computed in actual units and converted by this package, so percentage, percentile and standard-deviation scales follow one stated reporting convention in every sufficiency direction. Includes tidy summaries, threshold rules, plots, random-data generation, permutation tests, and power analysis. An ordinary least-squares line can be drawn beside the frontier as a central-tendency reference; it is an average-effect summary and never a component of a sufficiency claim. An empty-space pattern alone does not establish causality or deterministic sufficiency. Software Depends: R (>= 3.5.0) Imports: ggplot2 (>= 3.4.0), NCA (>= 5.0.2), stats, utils Suggests: testthat (>= 3.0.0) Young Chan <youngchanresearcher@gmail.com> Comprehensive R Archive Network (CRAN) Young Chan [aut, cre] GPL (>= 3) 2026-09-18 application/tgz https://CRAN.R-project.org/package=SCAtools doi:10.32614/CRAN.package.SCAtools