在比较三个以上序数变量中的因素时,我有一个问题。
我已经在Rstudio和Datacamp上进行了尝试。设置了特定的顺序以处理两个以上的序数变量(低,中,高)后,在比较高和中时,为什么“ high> medium”会产生FALSE?
temperature_vector <- c("High", "Low", "High","Low", "Medium")
factor_temperature_vector <- factor(temperature_vector, order = TRUE, levels = c("Low", "Medium", "High"))
factor_temperature_vector
#The above line returns:
#[1] High Low High Low Medium
#Levels: Low < Medium < High
high <- temperature_vector[1]
medium <- temperature_vector[5]
low <- temperature_vector[2]
high > low #returns FALSE
high > medium #returns FALSE. Why?
已解决:
需要比较因素而不是变量:
high <- **factor_**temperature_vector[1]
medium <- **factor_**temperature_vector[5]
low <- **factor_**temperature_vector[2]
答案 0 :(得分:0)
对标识符的分配来自character
向量,而不是factor
向量。对于character
字符串,排序是字母顺序,其中h
小于m
high <- factor_temperature_vector[1]
medium <- factor_temperature_vector[5]
low <- factor_temperature_vector[2]
high > low
#[1] TRUE
high > medium
#[1] TRUE