Model | ACF | PACF |
MA(q) | Cuts off after lag q | Infinite exponential decay and/or damped sinusoid—tailing off |
AR(p) | Infinite exponential decay and/or damped sinusoid—tailing off | Finite-cuts off after lag p |
ARMA(p,q) | Infinite exponential decay and/or damped sinusoid—tailing off | Infinite exponential decay and/or damped sinusoid—tailing off |