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使用R满足某些条件时使用两栏生成新的变量
原标题:creating a new variable using two columns when they satisfy certain conditions using R

我正在提供这一实例数据,以便了解我的问题。

aid=c(1,2,3,4,5,6,7,8,9,10)
foson=c(0,1,2,0,6,9,0,0,3,0)
fosof=c(0,0,2,3,0,0,0,5,0,0)
data=data.frame(aid,foson,fosof)

现在,我需要创造新的变量(栏目),列明数据元,条件如下:

if foson==0 and fosof==0, then hist = 0;
if foson >=1 and fosof==0, then hist = 1;
if foson==0 and fosof>=1, then hist = 2; and
if foson>=1 and fosof>=1, then hist = 3

我试图使用“ifelse”功能,但未能做到。

我希望这个问题足够清楚。

感谢一切帮助,

Bazon

最佳回答

Ramnath的解决办法是好的,但用ifelse解决。 您可以这样做:

data$hist <- ifelse(data$foson>=1,ifelse(data$fosof>=1,3,1),ifelse(data$fosof>=1,2,0))

但这意味着,在<条码>、或<条码>中,<条码/代码>的任何内容为<条码><1。 它将选择<代码>=0的选择,但从您的数据来看,这似乎不是一个问题。

问题回答

一个可能的解决办法是:

data$hist = (data$foson >=1) + (data$fosof >=1)*2

这应当给你预期的结果。





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