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(a) Time series plot of under-five mortality rates in Nigeria for ARIMA modeling, 1964–2017 (B) Third order difference of yearly under-five mortality rates (c) Autocorrelation function plot of third order differenced under-five mortality rates (d) Partial autocorrelation function plot of third order differenced under-five mortality rates. D3: third order differencing, U5M: under-five mortality, grey color in plots C and D: 95% Confidence Interval
