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Necessity as a Function of Skewness

With necessary condition analysis (NCA), a necessity effect is estimated by calculating the amount of empty space in the upper left corner in a plot with a predictor X and an outcome Y. In the present simulation study, calculated necessity effects were found to have a negative association with the s...

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Detalles Bibliográficos
Autores principales: Sorjonen, Kimmo, Wikström Alex, Jenny, Melin, Bo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5742232/
https://www.ncbi.nlm.nih.gov/pubmed/29312058
http://dx.doi.org/10.3389/fpsyg.2017.02192
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author Sorjonen, Kimmo
Wikström Alex, Jenny
Melin, Bo
author_facet Sorjonen, Kimmo
Wikström Alex, Jenny
Melin, Bo
author_sort Sorjonen, Kimmo
collection PubMed
description With necessary condition analysis (NCA), a necessity effect is estimated by calculating the amount of empty space in the upper left corner in a plot with a predictor X and an outcome Y. In the present simulation study, calculated necessity effects were found to have a negative association with the skewness of the predictor and a positive association with the skewness of the outcome. Also the standard error of the necessity effect was found to be influenced by the skewness of the predictor and the skewness of the outcome, as well as by sample size, and a way to calculate a confidence interval for the necessity effect is presented. At least some of the findings obtained with NCA are well within the range of what can be expected from the skewness of the predictor and the outcome alone.
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spelling pubmed-57422322018-01-08 Necessity as a Function of Skewness Sorjonen, Kimmo Wikström Alex, Jenny Melin, Bo Front Psychol Psychology With necessary condition analysis (NCA), a necessity effect is estimated by calculating the amount of empty space in the upper left corner in a plot with a predictor X and an outcome Y. In the present simulation study, calculated necessity effects were found to have a negative association with the skewness of the predictor and a positive association with the skewness of the outcome. Also the standard error of the necessity effect was found to be influenced by the skewness of the predictor and the skewness of the outcome, as well as by sample size, and a way to calculate a confidence interval for the necessity effect is presented. At least some of the findings obtained with NCA are well within the range of what can be expected from the skewness of the predictor and the outcome alone. Frontiers Media S.A. 2017-12-19 /pmc/articles/PMC5742232/ /pubmed/29312058 http://dx.doi.org/10.3389/fpsyg.2017.02192 Text en Copyright © 2017 Sorjonen, Wikström Alex and Melin. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Psychology
Sorjonen, Kimmo
Wikström Alex, Jenny
Melin, Bo
Necessity as a Function of Skewness
title Necessity as a Function of Skewness
title_full Necessity as a Function of Skewness
title_fullStr Necessity as a Function of Skewness
title_full_unstemmed Necessity as a Function of Skewness
title_short Necessity as a Function of Skewness
title_sort necessity as a function of skewness
topic Psychology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5742232/
https://www.ncbi.nlm.nih.gov/pubmed/29312058
http://dx.doi.org/10.3389/fpsyg.2017.02192
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