why does the model always break in backtesting around mid-2010 ?

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I am backtesting a few ideas and they always seem to fall apart in 2010.  Was this a change in legislation ?
asked Sep 14, 2014 by stocky1971 Novice (220 points)

2 Answers

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There was a change to starting stalls numbering on right handed tracks at the start of the Flat season in 2011, but apart from that, no....
answered Oct 25, 2014 by colin Frankel (19,280 points)
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Wasn't there also a change to the class structure of British horse races around that time?
answered Oct 25, 2014 by SlightReturn Listed class (2,850 points)
Yes I think you're right - also lots of shake ups to the fixture system have been in progress over the last 5 years in general, as bookies seek to increase the amount of handicaps and reduce predictability in horseracing...
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