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**MOZ** · 03-13-2010, 09:01 PM

Originally Posted by Z&MLoh

I reckon there is an upward trend (or level) on most categories except (1600-1899) and (1900-2199) ratings group.

First, thank you for the work done to create this ratings analysis.

The underlying population is changing over time.

I would speculate the third category are taking rating points from the two rating cohorts that seem to be on a down-ward trend.

03-13-2010, 09:01 PM	#133 (permalink)
MOZ Volunteer Join Date: Jul 2007 Location: Ozchess is the marginalised cyber-spot where cc-Mods choose to engage with cc-banned posters. Posts: 3,541	Originally Posted by Z&MLoh I reckon there is an upward trend (or level) on most categories except (1600-1899) and (1900-2199) ratings group. First, thank you for the work done to create this ratings analysis. The underlying population is changing over time. Some players drop off the active playing list. Some players join the active playing list Some players improve their chess playing skill. I would speculate the third category are taking rating points from the two rating cohorts that seem to be on a down-ward trend. __________________ FReedom though Fischer-Random chess to enjoy the whole game.