
Saturday Lotto Explanations and Definitions 
Number of Times Drawn (NTD) Analysis
Put simply this is the number of times that a particular ball has been drawn. The higher the number the more times it has been drawn.
When used to rank the balls on this site, the number of times drawn is converted to a score out of 100 with the most drawn ball scoring 100 and the least drawn scoring 0. When considered in isolation, it is possible to have several balls all with the same score which is why you may occasionally see more than six balls displayed in the high or low scores section of the page.
Time Between Draws (TBD) Analysis
This statistic represents the number of draws that have passed since a particular number was last drawn. A value of 1 means that the number was drawn in the last draw, a 2 meaning it came out 2 weeks ago and so on and so forth.
There are 2 factors used to determine the TBD score when ranking the balls. First, we look at the history of the ball looking at its historical TBD pattern. We then compare the current score to that pattern and give it a score. Next we then take a look at the number of TBD scores higher and lower than the current score and again turn that into a score. The final score out of 100 is then calculated using these two scores.
Number Correlation (CORO) Analysis
In this method of ranking the first step is to choose a number, we then take a look at the overall draw history to determine which balls are more frequently drawn with that number. For each ball, the number of times each other ball has been drawn with it is converted to a score out of 100, the most frequent scoring 100 and the least scoring 0.

Interpretation 
NTD
There are two ways you can interpret this depending on how you see the game.
In the first option you can choose to see a high number as an indication that the ball has a higher chance of being drawn in upcoming games. This would be the case if you believe that there is an inbuilt bias in the draw mechanism.
The second option is the reverse of this. If you believe that over time all numbers should be drawn about the same number of times, you would look at a low number as an indication that the ball should be overdue and take that as an indication that it has a higher chance of being drawn.
TBD
As with the NTD score there are two ways of looking at the TBD number. If all things are considered equal, a high number or a long time since a ball has been drawn can be seen as an indication that it is overdue to be drawn or conversely, a low number can be seen as an indication that the ball is more likely to be drawn as there could be some kind of bias acting in its favour.
CORO
This statistic works in a similar way to the NTD numbers mentioned above except that instead of a straight out count of the number of times drawn, it is broken down into the number of times drawn relative to the other numbers.
Example: If Ball 1 has been drawn a total of 100 timed its NTD =100. Out of these 100 games, Ball 3 is drawn in the same game 17 times. This means that when Ball 1 is chosen for analysis, the score for Ball 3 will be derived from the 17 times that they were drawn together.

