Fig. 3
From: Daily volume of cases in emergency call centers: construction and validation of a predictive model
Agreement between number of cases predicted and number observed (test period, Bland and Altman method). The average difference shows if one of our two methods of measurement tends to produce consistently lower or higher values than the other (Predicted number of cases tends to be lower than observed number, here the mean bias is − 13 cases). 95% of the differences between each pair of points are between Mean + 1.96SD and Mean - 1.96 SD (here 95% of the differences between predicted number of cases and observed number were comprised between − 124 and + 150 which are the “limits of agreement”)