Fig. 2.
Correlogram for daily surgical volume time series. Autocorrelation analysis of the 146 weekday run of case count data used to create the final case count autoregressive time-series models. Autocorrelation analysis was performed to determine whether each day’s observed volume could be predicted from the case counts of prior days. Asterisks indicate prior (lag) days for which the current day volume shows a statistically significant autocorrelation.