我需要使用条件选择来创建数据的子集,其中包含来自控制组的记录,权重> 440,DMI> 13.我还需要在这个数据子集中找到记录数量最多的牛品种。
我试过的代码是:
> dat2[dat2$Treatment == "control" & dat2$Weight>440 & dat2$DMI >13]
但我不确定这是否正确。
> dput(head(dat2))
structure(list(Animal = 1:6, Weight = c(455.96, 418.05, 436.31,
448.22, 418.35, 467.78), DMI = c(14.81, 17.63, 17.81, 15.01,
15.42, 12.58), Breed = structure(c(3L, 3L, 2L, 2L, 3L, 3L), .Label =
c("Angus",
"Brahman", "Hereford", "Nelore"), class = "factor"), Treatment =
structure(c(1L,
3L, 1L, 1L, 3L, 1L), .Label = c("Control", "High", "Low"), class = ]
"factor"),
Sex = structure(c(1L, 1L, 2L, 2L, 1L, 1L), .Label = c("Castrate",
"Female", "Male"), class = "factor")), .Names = c("Animal",
"Weight", "DMI", "Breed", "Treatment", "Sex"), row.names = c(NA,
6L), class = "data.frame")
答案 0 :(得分:0)
使用wheight和dmi提取控件,正如@akrun所指出的那样:
subset <- dat2[dat2$Treatment == "Control" & dat2$Weight>440 & dat2$DMI >13,]
要获得具有最多出现次数的牛品种,您可以使用table
:
table(subset$Breed)