New York City Marathon Data Visualization

This is a set of charts that analyze the results of the New York City Marathon from 1970 to 2013 published by nyrr.org to the public internet without restriction or copyright. No affilliation is intended or implied. comments? send to marathon @ turbek.com
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for example "meb keflezighi" (who won in 2009)

This chart shows the difference between the averages of the 5 20% groups from 1981 through 2010, in seconds. The general direction is down, suggesting that the women are closing the gap to the men. The slowest 20% of finishers shows a larger gap between men and women than the other groups.