[R] Help w/an old R program I've rediscovered and want to make work

[pce369]

Hi Barry, and thanks very, very much for your comments.

OK, I think I've resolved the issue of where the file is, as the program
runs...and then dies. The error message I am getting now is: 

"Error in tapply(MCP, MCPsplitlist, MCPfunction) : arguments must have same
length"

No idea what this means. Any idea? Thanks kindly -

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