[R] Error in inherits(x, "ordered") : subscript out of bounds (MLSV, according to Wang et al., 2007)

[Braem M]

Dear,

Im trying to run the R program, provided by Wang (2007), for the analysis of
nested frailty models. While running this program I get the following error:

Error in inherits(x, "ordered") : subscript out of bounds

Could someone tell me what the problem is in this case?

Thanks in advance.

Kind regards, Marie
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