Necessary Condition Analysis R package NCA version 5.0.1 Performs a Necessary Condition Analysis (NCA). (Dul, J. 2016. Necessary Condition Analysis (NCA). ''Logic and Methodology of 'Necessary but not Sufficient' causality." Organizational Research Methods 19(1), 10-52) <doi:10.1177/1094428115584005>. NCA identifies necessary (but not sufficient) conditions in datasets, where x causes (e.g. precedes) y. Instead of drawing a regression line ''through the middle of the data'' in an xy-plot, NCA draws the ceiling line. The ceiling line y = f(x) separates the area with observations from the area without observations. (Nearly) all observations are below the ceiling line: y <= f(x). The empty zone is in the upper left hand corner of the xy-plot (with the convention that the x-axis is ''horizontal'' and the y-axis is ''vertical'' and that values increase ''upwards'' and ''to the right''). The ceiling line is a (piecewise) linear non-decreasing line: a linear step function or a straight line. It indicates which level of x (e.g., an effort, a characteristic) is necessary but not sufficient for a (desired or undesired) level of y (e.g., good performance or disease). A quick start guide for using this package can be found here: <https://repub.eur.nl/pub/78323/> or <https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2624981>. Software Depends: R (>= 3.5.0) Imports: gplots, quantreg, KernSmooth, lpSolve, ggplot2, doParallel, foreach, iterators, plotly, truncnorm, DBI, RSQLite Suggests: testthat Govert Buijs <buijs@rsm.nl> Comprehensive R Archive Network (CRAN) Jan Dul [aut], Govert Buijs [cre] GPL (>= 3) 2026-04-28 application/tgz https://CRAN.R-project.org/package=NCA doi:10.32614/CRAN.package.NCA