当我尝试在R中定义我的线性模型时,如下所示:
lm1 <- lm(predictorvariable ~ x1+x2+x3, data=dataframe.df)
我收到以下错误消息:
Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) :
contrasts can be applied only to factors with 2 or more levels
有没有办法忽略它或修复它？有些变量是因素,有些则不是.
以下是我正在使用的所有变量:
str(ad.train)
$ Date : Factor w/ 427 levels "2012-03-24","2012-03-29",..: 4 7 12 14 19 21 24 29 31 34 ...
$ Team : Factor w/ 18 levels "Adelaide","Brisbane Lions",..: 1 1 1 1 1 1 1 1 1 1 ...
$ Season : int 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 ...
$ Round : Factor w/ 28 levels "EF","GF","PF",..: 5 16 21 22 23 24 25 26 27 6 ...
$ Score : int 137 …