Fig. 2From: Time series prediction of under-five mortality rates for Nigeria: comparative analysis of artificial neural networks, Holt-Winters exponential smoothing and autoregressive integrated moving average modelsDiagnostic plots for ARIMA (0,3,2) of under-five mortality rates, Nigeria (1964–2017) (a) Residual plot (b) Inverse roots of MA polynomial (c) Autocorrelations of differenced rates (d) Impulse-response function plotBack to article page