The functions return the change of horse rating in underlying race comparing with last race. A positive value is for an increase while a negative value is for an decrease.
Syntax
HrRatingDiff(nBackRaces,'fCondition',nDefaultVal)
JrRatingDiff (nBackRaces,'fCondition',nDefaultVal)
SrRatingDiff (nBackRaces,'fCondition',nDefaultVal)
Returns
Numeric
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