7 Referências
Peng, R.D. and Welty, L.J. (2004) The NMMAPSdata package. R News 4(2).
Wood, S.N. (2006, 2017) Generalized Additive Models: An Introduction with R.
Peng, R.D., Exploratory Data Analysis with R (2016) This version was published on 2016-07-20. This book is for sale at http://leanpub.com/exdata
OLIVEIRA, Paulo Felipe de; GUERRA, Saulo; MCDONNELL, Robert. Ciência de Dados com R – Introdução. Brasília: Editora IBPAD, 2018.
https://www.curso-r.com/material/pipe/
Dasu T, Johnson T (2003). Exploratory Data Mining and Data Cleaning. Wiley-IEEE.
http://leg.ufpr.br/~fernandomayer/aulas/ce083-2016-2/02_funcoes_e_objetos.html#classes_de_objetos