SCAtools: Direction-Aware Sufficiency Condition Analysis
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.
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