It's a funny thing about those ratings, they seem to be systems rather than ratings.
They pick enough longshots to make it breakeven at TAB prices, yet bear absolutely no correlation to the variance of traditional ratings.
In other words BR ranks have wide variances.
Backing overlays and underlays has no degree of worth.
Top rated that are favourite are worse than favourites alone.

Not potting them, but I think the term "ratings" is a misnomer in this case.

Is there also a direct relationship between unitab ratings and the Racing and Sports Website - Rating "EST" column

If a system has limited selections (100-500) over a period of 11 years but still producing a positive POT, is a newbie looking at generating other systems better off looking at systems with 1000+ selections and a smaller POT even if over a period of 2-3 years.

Which would give you more confidence of a future profit?

A) Testing over 11 years with a positive POT but 100-500 bets (More variables in system)
B) 1000+ selections over 3-4 years with a positive POT. (3-5 Variables in a system)

Cheers

I've run this comparison exercise over all the data I've collected over the past few months. Maybe it can be useful to others who have developed mechanical systems that rely on such information...

Averages for winners only:
Category, Oct, Nov, Dec, Jan thus far
UniTAB Rating, 94.74, 94.92, 94.77, 94.26
UniTAB Rank, 3.60, 3.58, 3.68, 3.93
Neural Rating, 133.16, 134.52, 132.74, 129.44
Neural Rank, 3.98, 3.99, 4.03, 4.10
DS Rating, 31.58, 31.33, 30.52, 29.44
DS Rank, 3.87, 3.82, 4.04, 4.05
Career Prize Money, $4.696k, $3.174k, $2.722k, $2.255k
Career PM Rank, 4.37, 4.45, 4.42, 4.58
Finish Win Div (Uni), $8.20, $7.80, $7.81, $7.52
Finish Place Div (Uni), $2.48, $2.41, $2.46, $2.42

Averages for fo all finishing 1st, 2nd or 3rd:
Category, Oct, Nov, Dec, Jan
UniTAB Rating, 93.75, 94.05, 93.95, 93.67
UniTAB Rank, 4.02, 3.97, 4.12, 4.14
Neural Rating, 128.10, 127.52, 125.04, 124.92
Neural Rank, 4.23, 4.32, 4.49, 4.42
DS Rating, 30.78, 30.51, 29.94, 28.74
DS Rank, 4.18, 4.17, 4.30, 4.28
Career Prize Money, $3.632k, $2.848k, $2.435k, $2.147k
Career PM Rank, 4.63, 4.74, 4.99, 4.82

Obviously, the dropping average ratings and rising ranks of winners/placegetters show that December and January have been more inconsistent for these ratings due to the lower class of the fields.

It would be great if anyone can provide similar figures from before October last year. That might give an indication as to when things will "return to normal".