eval 中的错误（predvars、data、env）：未找到 object 'V1'

Question

I'm trying to use the linear regression's tools:

data=read.table("http://users.stat.ufl.edu/~winner/data/pgalpga2008.dat",  check.names=FALSE)

Then I have to select only female golfers so I did:

datF <- subset(data, V3==1, select=1:2)

Where V3 is the label of the third column. Now I should apply the linear regression method so I did:

datF.lm=lm(V1~V2)

Where V1 and V2 are the label of the other two column but I came through this error and I can't understand why.

Answer 1

Yes, as slava-kohut states, the lm() function requires a reference to the dataframe as one of its arguments. If you don't specify data = datF , lm() doesn't know where to look for the variables V1 and V2.