ARTICLE SYNOPSIS...Holt-Winter Channel: taking the formula one step beyond by Ichu Cheng October 19,1987 witnessed the biggest one-day drop in stock prices in history. The Dow Jones Industrial Average (DJIA) fell 616 points or 26% in a single day. The drop caught most inv
ARTICLE SYNOPSIS...Holt-Winter Channel Calculation The Holt-Winter formula estimates the three quadratic coefficients recursively as follows: Ft+1 = (l - a) (Ft + Vt + 0.5 At) + aCt+1 Vt+1 = (l - b) (Vt + At) + b(Ft+1 - Ft) At+1 = (l - c) At + c (Vt+1 - Vt) where Ct =