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  • R语言实战-数据类型3-因子(factor)

    因子(factor)demo2-3.R

    数据的类型分为名义型、有序型和连续型

    其中名义型和有序型被称为因子

    1 > weekdays<-c('Sunday','Monday','February','Wednesday','Thursday','Friday','Saturday')
    2 > weekdays
    3 [1] "Sunday"    "Monday"    "February"  "Wednesday" "Thursday"  "Friday"    "Saturday" 
    4 > weekdays<-factor(weekdays)
    5 > weekdays
    6 [1] Sunday    Monday    February  Wednesday Thursday  Friday    Saturday 
    7 Levels: February Friday Monday Saturday Sunday Thursday Wednesday
    8 > #默认因子排序是按照字符排序

    可以自己指定因子的顺序

    1 > weekdays<-factor(
    2 +   weekdays,
    3 +   ordered = T,                 
    4 +   levels = c('Sunday','Monday','February','Wednesday','Thursday','Friday','Saturday'))
    5 > weekdays
    6 [1] Sunday    Monday    February  Wednesday Thursday  Friday    Saturday 
    7 Levels: Sunday < Monday < February < Wednesday < Thursday < Friday < Saturday
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  • 原文地址:https://www.cnblogs.com/qianheng/p/10802559.html
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