One way to analyse a system's viability is to have 3 or more lots of 150 batches of bets.
If it makes a profit in one lot but breaks nearly even on the other 2 batches it tells us there is some potential.

Another way is to break up the stats over odd & even numberered races .
This will tell us if there is a major disparity in the results.

If there is a huge difference , it tells us that the overall results may have been an annomily & needs futher working..

It's a strong idea to have the stats over 4-5 years.
I have seen systems work brilliantly, say over 3 years only to see it fall in a heap in the 4th year.

If one can get the SR consistant over that period , the next challenge is trying & seek the best prices.
Trying to squeeze a profit using single TAB prices is very difficult longterm, compared to best of 3 TOTS e.g. Sportsbet or Betfair or Bookies.

Its a strong idea to have a min. price acceptable.

After using Betfair, one will see how much we have been ripped by the TABs.
all these years.

If one is using multiple systems , I have found it more profitable , not to double up on selections already selected by the other systems.
The reason being is, if a horse is selected say 3 times, it does not mean that it has 3 times the chance of winning so why place 3 times the amount of money & risk on it.

I feel it is important to try & strive for a consistant SR first, of approx 22-25% if win betting with some profit, any less & one must be prepared for long runs of outs of 30+.
The profit will always vary, month to month, that's why it is so important to use a medium that can maximise a price that is better than a single TAB.

Cheers.

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Cheers.