Devon wrote:
>  bias=: (#%~[:<:#)    NB. Ratio of N to N-1 

This can be written more succinctly:

        (%~<:)@:#

The (identical) verb would be even shorter if you substituted  @  for  @:  .  
But, as a matter of style, I prefer  @:  to  @  except in cases where the 
change would make a difference which I desire.  My favorite example is  [EMAIL 
PROTECTED]  .

That way, when I see an  @  in my code, it stands out.  I know I used it 
intentionally, and I should pay closer attention.  

-Dan

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