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Table 3 Effect estimate summaries

From: Comparison of six statistical methods for interrupted time series studies: empirical evaluation of 190 published series

  N Absolute value of effect estimate
Level change
Median (IQR)
Slope change
Median (IQR)
ARIMA 189 1.40 (0.63,2.90) 0.13 (0.05,0.26)
OLS (NW)a 190 1.49 (0.60,3.03) 0.13 (0.06,0.27)
PW 189 1.33 (0.57,2.81) 0.13 (0.05,0.26)
REML (REML-Satt)a 181 1.22 (0.47,2.56) 0.13 (0.05,0.25)
  1. Abbreviations: IQR Interquartile range, ARIMA Autoregressive integrated moving average, OLS Ordinary least squares, PW Prais-Winsten, REML Restricted maximum likelihood
  2. a The NW and OLS methods use the same estimator for level and slope change, as do REML and REML-Satt