我正在尝试在R
中运行以下代码行new <- data.frame(newdb,
ifelse(newdb$centile >=0 & newdb$centile < 3,"1",
ifelse(newdb$centile >=3 & newdb$centile < 6,"2",
ifelse(newdb$centile >=6 & newdb$centile < 9,"3","4"))))
但是我收到以下错误
错误：意外＆＃39;）＆＃39; in＆＃34; ifelse（newdb $ centile＆gt; = 6＆amp; newdb $ centile＆lt;＆gt; 9，＆＃34; 3＆＃34;，＆＃34; 4＆＃34;））＆＃34;