Webalizer and Awstats produce different stats

[sloop]

I have had several customers notice that there is a big difference between the stats from Webalizer and Awstats. here is an example:

Webalizer visits per day
4/1 861
4/2 907
4/3 989
4/4 1109
4/5 1205
4/6 1082

Awstats visits per day
4/1 639
4/2 638
4/3 763
4/4 865
4/5 878
4/6 777

What is the reason? Which one is right? Or do they somehow measure differently?

thanks

[HostIt]

They are both technically correct (as they both use the same log files), but they use different methods to calculate the stats. I believe for example that AWStats is a little more intelligent in terms of not counting error pages in overall stats... Just little things like that