Ciao Sig. Ernesto
upper
Mov((21 * Sum(Cum(1) * C,21) - Sum(Cum(1),21) * Sum(C,21)) /
(21 * Sum(Pwr(Cum(1),2),21) - Pwr(Sum(Cum(1),21),2))* Cum(1) +
(Mov(C,21,S) - Mov(Cum(1),21,S) * (21 * Sum(Cum(1)* C,21) -
Sum(Cum(1),21) * Sum(C,21))/ (21 * Sum(Pwr(Cum(1),2),21)-
Pwr(Sum(Cum(1),21),2)))...