4. A computer implemented method according to claim 1 , wherein the acceptability criteria is based on the occurrence of results which cross a predetermined threshold when the results are considered in conjunction with the level of certainty.
5. A computer implemented method according to claim 4 , wherein the predetermined threshold is 0.5, and wherein consideration of a result in conjunction with the level of certainty includes: if the result is greater than 0.5, subtracting the standard deviation to the result to see whether the resulting value is less than 0.5; or if the output is less than 0.5, adding the standard deviation to the result to see whether the resulting value is greater than 0.5.