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Fig. 4 | BMC Medical Research Methodology

Fig. 4

From: Evaluation of statistical methods used in the analysis of interrupted time series studies: a simulation study

Fig. 4

Empirical standard error (SE) of the level change. The horizontal axis shows the length of the time series, the vertical axis shows the empirical SE. The five vertical columns display the results for different values of autocorrelation. The simulation combination presented is for a level change of 2 and slope change of 0.1; however, other combinations give similar results. Abbreviations: ARIMA, autoregressive integrated moving average; OLS, ordinary least squares; PW, Prais-Winsten; REML, restricted maximum likelihood

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BMC Medical Research Methodology

ISSN: 1471-2288

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