You're absolutely right.
However, as I mentioned in a thread yesterday concerning averaging without
zeroes, the transition from positive to negative predisposes the presence
of
zeroes.
Therefore, one can assume ... no 0's ... no negatives.
Though your point is well taken, since we never actually know how or where
our suggestions will be used.
--
Regards,
RD
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Please keep all correspondence within the Group, so all may benefit !
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"David Biddulph" <groups [at] biddulph.org.uk> wrote in message
But I don't think that formula works correctly if there are negative
numbers?