[R] liner regression for multiple keys

[newbie_2010]

Hi Ben it's working good except no values of 4th column in output.
And also if the file is large I'm getting the following error.

Error in pf(q, df1, df2, lower.tail, log.p) : 
  Non-numeric argument to mathematical function


I rechecked if I have any non numeric arguments the defined columns.
Inputfile is good.
Any suggestions on this.

Thanx

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