4.1 一个示例
一个数据集中可能含有几十个变量和成千上万的观测，但为了简化示例，我们仅选取了5行10列的数据可以使用代码清单4-1中的代码创建一个包含表4-1中数据的数据框。
manager <- c(1, 2, 3, 4, 5)
date <- c("10/24/08","10/28/08","10/1/08","10/12/08"，"5/1/09")
country <- c("us","us","us","uk","uk")
gender <- c("M","M","F","F","M")
age <- c(32,45,25,39,92)
ql <- c(5,3,3,3,2)
q2 <- c(4,5,5,3,2)
q3 <- c(5,2,5,4,2)
q4 <- c(5,5,5,NA,2)
q5 <- c(5,5,2,NA,1)
leadership <- data.frame(manager,date,country,gender,age,
ql,q2,q3,q4,q5, stringsAsFactors=FALSE)
4.2 创建新变量
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