[R] error message

[wangwallace]

I tried it several times. it still gives me the same error.

I also used traceback()

here is what I got:

> traceback()
3: `[.data.frame`(df, -s1$SubID, )
2: df[-s1$SubID, ]
1: crossed1(agr)

But I don't think there is anything wrong with it......
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