Cross correlation results for normal, arrhythmogenic and morphology changing signals with different values of correlation factors.

CF-Correlation factor, TP-True positive, FP-False positive, TN-True negative, FN-False negative, PPV-Positive predictive value.
From the table, it can be seen that PPV and specificity show significant improvement with an increase in CF. Experimental results have shown that CF between the ranges of 0.96–0.98 produce consistent results.

CF：相关系数（Correlation Factor），TP：真阳性（True Positive），FP：假阳性（False Positive），TN：真阴性（True Negative），FN：假阴性（False Negative），PPV：阳性预测值（Positive Predictive Value）。由该表格可见，随着CF值的升高，阳性预测值与特异性均得到显著提升。实验结果表明，当CF取值处于0.96至0.98区间时，可获得稳定一致的实验结果。