I used some numbers from (sc2ranks.com) to look at the Racial Distribution at high niveau. My visualisation of the numbers can be found here (a version from two days later):
While it is known that Blizzard's Matchmaking Algorithm is functional (TL Thread), it was not clear how the same win percentage per race was computed. Some told that there is a racial divergence between diverse skill levels (Bronze League to Diamond League), because new player tend to stay at the campaign's race Terran and the Zerg mechanics may be harder to learn. An alternative to this hypothesis is that people tend to chose race's which let them easier win. If this would be true we should see a race more often if it makes winning simplier. This does not mean that if a race wins often this race would be more easy to play.
Some suggested to compare the racial distribution (RD) at high skill levels as indicator for imbalance or more likely as indicator for the lack of exploitable gamestyle. I think this indicator should be seen as a trend on higher skill levels - and more important as it's change, if either new strategies and tactics are discovered, or there are gameplay changes (patches, etc.) implemented.
The upcomming patch will change gameplay in special situations quite heavily and we should see a shift in the high level racial distribution over some time (player's Inertia) till an equilibrium is found again (I am not sure if there will be an equilibrium, but it could exist). The time of the shift and the endtime will be good situations to overlook some presumptions we can create right now.
I think it would be interesting to do estimations about the post patch use of various units, since it gives us a little time to figure out new concepts before they are established on all servers. This thread could be general discussion about those changes - if it gets more strategy biased it could be moved to the strategy directory.
*Edit: Added Sample Count*
*Edit: Good post, with things I would like to see happen*
*Edit: Data as CSV*
*Edit: Added the "plus" to the 1500 Intervall*
*Edit: Someone made a picture of the absolute numbers as you see the comparision is impossible without adjusting the scale*
*Edit mahnini did a nice post with a combined intervall 1100 to 1400*
*Edit Cotonou did a post in which he tries to motivate a null-distribution with the percentage of gold's league (P/T/Z/R 38%/32%/20%/10%) - if he is right, we should see no shift at all on the high level after the patch is released, but the same which happens on the gold level.*
*Edit: Good arguments:
The percentage will change fast in the top 20, my argument: we can look at the trend of the top 200. There is a racial bias in every league and we have to look at distribution's change to tell stuff. There is a temporal error in it which can be cleared with a second measurement right after the patch gets uploaded.
But still my question is: What are we able to tell with this data? What would we think will happen if the patch changes gameplay? Is there a distribution's equilibrium right now? This are the important questions I really would like to see answered.
*Edit: Added the version from today * + Show Spoiler +
*Edit: Toxigen made a nice comment and linked us back to the beta's history and the old racial distribution.*
*Edit: Scarmath crawled sc2ranks.com and grouped players into bins, before finally performing Individual Chi Square tests and shows us his findings.*
*Edit Scarmath and Sentinent have done some calculation I agree with and visualized them on this page ff.*