Dichotomizing continuous predictors in multiple regression: a bad idea. Royston, P., Altman, D. G., & Sauerbrei, W. Statistics in Medicine, 25(1):127–141, 2006.
Dichotomizing continuous predictors in multiple regression: a bad idea [link]Paper  doi  bibtex   
@article{royston_dichotomizing_2006,
	title = {Dichotomizing continuous predictors in multiple regression: a bad idea},
	volume = {25},
	issn = {1097-0258},
	url = {http://dx.doi.org/10.1002/sim.2331},
	doi = {10.1002/sim.2331},
	number = {1},
	journal = {Statistics in Medicine},
	author = {Royston, Patrick and Altman, Douglas G. and Sauerbrei, Willi},
	year = {2006},
	keywords = {categorization, clinical research, continuous covariates, dichotomization, efficiency, regression},
	pages = {127--141},
}

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