If you're of the mindset that trending digits become hot, before being replaced by other trending digits, I've got a pretty good system for you. Obviously you know my mindset - that it won't raise your odds - but I've seen it work so well sometimes that I've questioned that notion myself.
Basically you take any set of recent numbers (I always seperated midday and evening when I used to use this system) and find about 3 digits that have showed up in every draw. This shouldn't be hard - it usually happens as a result of the odds in P3.
I'll use the most recent NJ Pick 3 as my basis. The draws were, from most recent to least recent.....
605
282
825
804
789
294
043
562
554
421
231
404
368
813...
OK you don't have to go near that far back - I was gonna keep inputting them until the trend fall apart but it appeared to go on for a while. Anyway, you give the most recent draws priority.
They digits that have appeared continously are 0-2-4-8, but the I always prefered a smaller sample of draws, and less digits, so let's go with 0-2-8, because the 4 is only necessary if you go far back.
In that case the pairs you would want to focus on for this upcoming draw are 02-08-28 and maybe 04-24-48. Using this method, I've had ridiculous hot streaks - and it's more flexible than a method that incorporates a pyramid shape and inputs numbers based on frequency. I also liked it because it allows for intuition, cold digits, etc. to fill in the 3rd digit. The guy who introduced the concept to me had an algorithm - and said that for some strange reason he couldn't understand, the hit rate for when his pairs should, if he put the with the digits 0-3-6 would result in a win rate of 70 percent rather than the expected 30%.
If you're interested in beating the Pick 3 and believe it's possible - he's on this forum - I could point you to him in a PM, since I'm no longer a believer in these types of systems.