Hi Euclid

Hot and cold Numbers or active and idle concepts are selected by defininig a "hot cut off" level that has been productive with your particular lottery as determined by many "what if" experimentation with a particular lottery's database history. For a 6/49 lotto. many would say that a hot number cut off of the previous 10 draws works well. This means that the numbers that have most frequently appeared in the last 10 draws are expected to still be hot for lets say the next 10 draws. Re cold numbers for a 649 do not play a number simply because is has been absent for a long time. Gail Howard offers this advice and backs it up with an example in the Pennsylvainia lottery where on number went to sleep for a huge number of draws. The ball must have gained weight

Skip and hit patterns can provide a look at the bio rythym of an individual number. Many times a number goes to sleep and the enters a pattern of multipe hits over a series of draws.

Previous picks show up frequently in the next draw. Just a note that when I analyse for a prediction of the Top 20 for Lotto 649 I do not include the bonus number in the overall process but when looking for a number to repeat in the next draw, the bonus number is taken into account.

Root sums of numbers are acieved by adding up the numbers as follows:

1,2,3,4,5,6 would be 1+2=3+3=6+4=10=5=15=6=21 Then 2+1 =root sum of 3

Some players filter their bet combos to match a root sum that has been absent in the previous draws and is now anticipated to be due.

Pool depth of a game is the average number of draws within which all numbers would be expected to appear. For a 6/49 the pool depth is approx 25 - 28 draws.

For numerical followers VersaBet software has a great analyis feature called shadowing which checks out which numbers have a tendency to appear in the next draw after other numbers.

Sums, odd even, high low, tens groupings etc. are as you notes generally used for filtering the bets and can reduce a lot of lines down to an affordable set of plays. They are not used for individual numbers but rather the construction of the whole bet combination (all 6 numbers).

Your investigation into the processes of lottery predictions is well focused and you will no doubt achive a PhD in your studies in the College of Lotto Knowledge

I would suggest that you could check out some of the major players in lotto software, find one that suits your needs and it will really help with the volumous amount of number management and data history analysis that is associated with a complete application of these concepts as they apply to your specific lottery.