PsiMA2(mean, volatility, coef1, coef2, err0, err1)

PsiMA2 produces a second order moving average time series with mean mean, volatility volatility, moving average coefficients coef1 and coef2 and error terms err0 and err1. 

The autocorrelation function for the PsiMA2 time series is depicted by an autocorrelation function (ACF) that reduces to 0 after lag 2 and a partial autocorrelation function (PACF) that decreases geometrically. 

For more information, see the Analytic Solver Reference Guide downloadable from Analytic Solver by clicking Help -- User Guides -- Analytic Solver Reference Guide.