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), 1052, <https://journals.sagepub.com/doi/full/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 xyplot, 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 xyplot (with the convention that the xaxis is ''horizontal'' and the yaxis is ''vertical'' and that values increase ''upwards'' and ''to the right''). The ceiling line is a (piecewise) linear nondecreasing line: a linear step function or a straight line. It indicates which level of x (e.g. an effort or input) is necessary but not sufficient for a (desired) level of y (e.g. good performance or output). 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>.
Package details 


Author  Jan Dul <jdul@rsm.nl> 
Maintainer  Govert Buijs <buijs@rsm.nl> 
License  GPL (>= 3) 
Version  3.2.1 
URL  https://www.erim.eur.nl/necessaryconditionanalysis/ 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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