Figure 4
A line graph titled 'PACF Plot for Maize Prices (Katsina)' displays the partial autocorrelation function. The horizontal axis represents the lag values ranging from 0 to 20, while the vertical axis represents the partial autocorrelation coefficient ranging from -1.00 to 1.00. The plot shows significant spikes at the first few lags, particularly at lag 1 and lag 2, indicating a low-order autoregressive structure. The shaded area around the horizontal axis represents the confidence interval, and the data points outside this interval are considered statistically significant.Partial Autocorrelation Function (PACF) Plot for maize prices in Katsina. Significant spikes at the first few lags suggest that a low-order autoregressive structure is appropriate for baseline time-series modelling. (Source: Authors’ own work)