I agree more with Jag331 than with Jake649, I would not have myself said "Extremely usefull", but from what little I have so far studied them, I say that they can be usefull or as usefull as anything else can be for the lottery if used just right.
I know enough about range gaps to say that they are one of the big keys to winning.
I also know of many different kinds of gaps there are so many different kinds of them, I study them a little at a time on and off, to me, filters are almost legion and range gaps are also almost legion.
You can learn a lot from range gaps about the lottery games.
But don't get me wrong, the ping pong balls as they say, don't have no memory of any numbers or draws.
But I would never say that there is no relationship between one draw and another or the next, there is no direct relationship of course, but there is a "Random Statistical Relationship" that connects them, that it is just as good or almost as good as a direct relationship.
As a filters patterns person I have seen this.
To me the term "Random Statistics" is an oxymoron, or a contradiction of terms, because if something has statistics as lottery numbers do, then they can't be truly random, A paradox ? I don't know !
I have always said that there is no such thing as random.
And statistics prove it, if not over the very short run, then over a longer one they will.
The make up of the game(s) and "Random" itself will equalize the statistics over long runs and time. They will always be almost the same statistics, the same repeated statistics over and over and over and over again.
There is nothing random about that, that I can see, I only see order, the universe is an ordered place. Even so called "Pseudo" random follows an underlying order or rules or universal laws that NEVER change.
God is not a random God but a lord of order and rules or laws.
To the unknowing and or untrained mind or unaware mind, there appears to be "Random Chaos", the only random chaos is evil itself and it is not so random either, even it has its degree of order.
The most random and chaotic thing that there is, is the mind and it has it's underlying reasons for its apparent chaotic behavior, nothing random there either.
Good luck. And sorry about going off on a tangent.