Z-Score = 
ZScore ( [YoY Change], [Mean YoY Change Excl Current], [StdDev YoY Change Excl Current] )
 
Modified Z-Score = 
ModifiedZScore ( [YoY Change], [Median YoY Change], [MAD YoY Change] )
 
Grubbs Score = 
GrubbsStatistic ( [YoY Change], [Mean YoY Change], [StdDev YoY Change] )
 
Gaussian Score = 
NormalTailProbability ( [YoY Change], [Mean YoY Change], [StdDev YoY Change] )