我想从矢量替换样本。例如:
set.seed(11)
x = as.data.frame(table(sample(c("one", "two", "three"), 5, replace = T, prob = c(0.05, 0.45, 0.5))))
返回:
x
Var1 Freq
1 three 4
2 two 1
有没有办法获得一个包含“one”freq的数据帧,其中value为0:
Var1 Freq
1 three 4
2 two 1
3 one 0
答案 0 :(得分:2)
你可以在上面定义一个因子和样本:
f_sa <- factor(c("one", "two", "three"))
x <- as.data.frame(table(sample(f_sa, 5, replace = T, prob = c(0.05, 0.45, 0.5))))
x
# Var1 Freq
# 1 one 0
# 2 three 4
# 3 two 1
如果您希望按频率而不是级别对其进行排序:
x[order(x$Freq, decreasing=T),]
# Var1 Freq
#2 three 4
#3 two 1
#1 one 0