[web:reg] ARMA estimates ARIMA moedels within Excel. After estimation the Add-In displays the coefficient results (including std.error, t-statistic, p-value), summary statistics (R², Adjusted R², Standard Error of Regression, sum of squared residuals, log likelihood, Durbin Watson, Akaike information criteria (AIC), Schwarz criteria (SIC), inverted MA/AR roots, Impulse response function as well as forecast evolution.