Would any kind soul explain to me please...

Why is there a descripancy in the count of hits between Link and that of log analyzer (Webtrend)?

Example: Links says that a certain link has been hit 870 times and Webtrend could only count 550 total hits for the same link.

Appreciate the reply...it's bugging me for weeks now and have tried different configuration on the log analyzer...have also check on any thread about this issue but could not find any...or maybe I'm just blind :-)