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The following custom formula will return the slope of a Linear Regression Line.
tp:=Input("Time Periods",1,200,21);
((tp*(Sum(Cum(1)*C,tp)))-(Sum(Cum(1),tp)*(Sum(C,tp))))/((tp*Sum(Pwr(Cum(1),2),tp))-Pwr(Sum(Cum(1),tp),2))
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