Another method of analysis is to have 3 sample batches of 150 races.

If one sample shows a profit & the others more or less break even , it may indicate that it has potential.

Therefore more testing of batches of 150 each.

If a majority of further batch testing shows a profit , it usually is telling us something.
e.g. 5 winning batches out of 8 batches ect.

It makes the whole analysis game a little clearer to look at rather than one great big batch of 1000 races in one big clump.

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Cheers.