[英]Variable lengths differ with random forest
I'm really new to R and I want to make a random forest.我对 R 真的很陌生,我想制作一个随机森林。 However I keep getting the same error-
但是我不断收到同样的错误-
Error in model.frame.default, lengths of variables differ.
I know this issue has been solved in another topic by constructing a formula from strings with as.
我知道这个问题已经在另一个主题中通过使用
as.
formula but I have really no idea how to do it.公式,但我真的不知道该怎么做。 Can you help me please?
你能帮我吗? Thank you.
谢谢你。
#A vector that has random sample of training values (70% & 30% samples)
index = sample(2,nrow(df), replace = TRUE, prob=c(0.7,0.3))
#Training Date
training = df[index==1,]
#Testing data
testing = df[index==2,]
#Random forest model
RFM = randomForest(df$Rating~., df$Customer_type, data = training)
Well what your error is, is that your independent variable is Rating
from the df
dataframe, but you selected data = training
.那么您的错误是,您的自变量是来自
df
dataframe 的Rating
,但您选择了data = training
。 This means that your random forest should take data from 2 different dataframes, which isn't possible.这意味着您的随机森林应该从 2 个不同的数据帧中获取数据,这是不可能的。 I guess that
randomForest(Rating ~ Customer_type, data = training)
would work.我猜
randomForest(Rating ~ Customer_type, data = training)
会起作用。
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