If you look at a host statistic, e.g:

[url=http://www.boincstats.com/stats/host_graph.php?pr=sah&id=408548' target='_blank]http://www.boincstats.com/stats/host_graph...r=sah&id=408548[/url]

At the bottom, in the section:
"Last 30 days (based on the daily update numbers)"

According to that statistic, I was first given the very first credits on 12-31-04 (at this host).
On this date, the position change is wrong: It should be calculated from the bottom of the statistics, not assuming that I am on the top of the statistics.

Other words:
It should be NOT "Postion = 108,383, Position Change =108,383 (down)"

More correct would be:
"Position = 108,383, Position Changes = (108,383 - "number of all persons with credits&quot up

It's on my to do list, but not very high.