[R] drop1() seems to give unexpected results compare to anova()

[Thomas P C Chu]

Thanks to Mr Dalgaard for his advice and everyone else who has 
contributed. Inclusion of an error term at the end of sim.set$y = ... 
line did cure my problems with drop1() and step().

I suppose it is my own inexperience in carrying out simulations caused 
such gaffe.

Thomas
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