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I am performing an interrupted time series analysis. I plotted the data and then checked for autocorrelation using ACF and PACF.
par(mfrow=c(1,2)) acf(residuals(model_ols), main="ACF") acf(residuals(model_ols), type = "partial", main="PACF")
How do make sense of this plot now? Can someone tell me what should be the next step?