Explaining the all_ and cond_ Series of Functions
NGCitygatePrice
all_min(NGCitygatePrice)
cond_min(NGCitygatePrice,0,year(Date)=2005)
cond_min(NGCitygatePrice,0,year(Date)=1998)
cond_min(NGCitygatePrice,1,year(Date)=1998)
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