standardize
Standardization in statistics means taking a score, subtracting the expected (read: average) value from that score, then dividing by the standardization. It is similar to what you were doing in spirit, but uses standard deviation instead of absolute range (what you were doing).
Maybe you want to consider 180 an average score in bowling (depends on who we're talking about here!), with a standard deviation of 40. Then a score of 240 gets standardized to a score of (240-180)/40 = +1.50. A score below 180 would get a negative value.
The hard part is picking the average and standard deviation ahead of time, in a way that is reasonable. (This is as subjective as you picking your golf ranges.)
alThor
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