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, <http://journals.sagepub.com/doi/abs/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 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: <http://repub.eur.nl/pub/78323/> or <https://ssrn.com/abstract=2624981>.

Version: | 3.0 |

Depends: | R (≥ 3.0.1) |

Imports: | gplots, quantreg, sfa, KernSmooth, lpSolve, ggplot2, progress |

Suggests: | testthat |

Published: | 2018-08-01 |

Author: | Jan Dul |

Maintainer: | Govert Buijs <buijs at rsm.nl> |

License: | GPL (≥ 3) |

NeedsCompilation: | no |

CRAN checks: | NCA results |

Reference manual: | NCA.pdf |

Package source: | NCA_3.0.tar.gz |

Windows binaries: | r-devel: NCA_3.0.zip, r-release: NCA_3.0.zip, r-oldrel: NCA_3.0.zip |

OS X binaries: | r-release: NCA_3.0.tgz, r-oldrel: NCA_3.0.tgz |

Old sources: | NCA archive |

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