随机丢弃200个健康实例。我如何在Rstudio中实现这个?
这是数据帧:
https://www.kaggle.com/code/jamaltariqcheema/model-performance-and-comparison/data
我试过了,但是我得到了一个错误。
kidney_disease$hd <- ifelse(test=kidney_disease$hd == 0, yes="Healthy", no="Unhealthy")
也许下面的方法可以解决问题。
用sample
随机选择行号,将默认值"Healthy"
赋给新列hd
,并将值"Unhealthy"
赋给随机选择的行。
set.seed(2022) # Make results reproducible
i <- sample(nrow(kidney_disease), 200)
kidney_disease$hd <- "Healthy"
kidney_disease$hd[i] <- "Unhealthy"