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

Table 4 Number of available comparisons for the statistical methods investigated (n = 190)

Number of comparisons	ARIMA	OLS	NW	PW	REML	REML-Satt
ARIMA	189	189	188	185	175	175
OLS		190	189	186	175	175
NW			189	186	174	174
PW				186	171	171
REML					175	175
REML-Satt						175

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, REML-Satt Restricted maximum likelihood with Satterthwaite small sample adjustment

ISSN: 1471-2288