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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