March 2018
Intermediate to advanced
528 pages
13h 2m
Portuguese (Portugal, Brazil)
Content preview from R para Data Science
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390 | Capítulo 19: Construção de Modelos
Por que há mais voos no sábado na primavera do que no outono? Perguntei a alguns
amigos norte-americanos, e eles sugeriram que é menos comum planejar férias em
família durante o outono por causa dos grandes feriados do Dia de Ação de Graças
e do Natal. Não temos os dados para nos certificar disso, mas parece uma hipótese
de trabalho plausível.
Vamos criar uma variável “term” (período) que capture aproximadamente os três
períodos escolares e vamos conferir nosso trabalho com um gráfico:
term <- function( date ) {
cut( date,
breaks = ymd( 20130101, 20130605, 20130825, 20140101
),
labels= c( "spring" ...
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