what is the difference between long term mean and mean

Hi, dear professor,
When i download some datasets from a site.
The mean value has two kind: long term mean and mean.
I want to know what is the difference between the two kind dataset?

Thank you!
Best wishes.

yours sincerely,
Libin Yan

2008-04-11

yanlibin

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Received on Fri Apr 11 2008 - 00:33:08 MDT