Fig. 4

Bland Altman plot of standardised slope change. Plots in the top triangle (blue points) show the difference in point estimates (row method – column method) on the vertical axis and average of the parameter estimates on the horizontal axis. Plots in the bottom triangle (orange points) show differences in standard errors on the vertical axis (= log(ratio of standard errors)) (column method – row method) and the average of the log of the standard errors on the horizontal axis. Red horizontal lines depict the average, red dashed lines depict the 95% limits of agreement (calculated as the average ± 1.96*standard deviation of the differences). Grey lines indicate zero. Abbreviations: ARIMA, autoregressive integrated moving average; OLS, ordinary least squares; NW OLS with Newey-West standard error adjustments; PW, Prais-Winsten; REML, restricted maximum likelihood. Note that REML with the Satterthwaite approximation is not presented because it only makes an adjustment to the confidence intervals, and not the standard errors