Please write the formula for the forecast model defining all variables, including assumptions

SLR = Simple Linear Regression

SLR Formulas: > A(tc) = A.int + b*tc ; tc given by customer; A(tc) = forecast of future cycle as requested by customer; tc = t requested by customer > A.int = A.av b*t.av ; A.int: backward extension of best fit line intercepting A-axis; b: slope of best fit line; time cycles > b = (sum(A*t) n*A.av*t.av) / (sum(t^2) n*(t.av)^2); slope = rise/run; n: number of past known cycles; t = 1, 2, 3, 4, 5

Please define all the variables and include assumptions