Receiver operating characteristic (ROC) curve was used for analyzing results and selecting cut off values.

根据受试者工作特征曲线（ROC）分析结果并选定阳性参考值。

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Engineering methods and measures to curve cut-off in the reach from Dagong to Wang 'an are mainly introduced in order to supply reference for abnormal river pattern training.

着重介绍了黄河下游大宫至王庵河段裁弯取直工程的方法和措施，可作为其他畸形河势治理时参考。

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Results Score of optimal cut off point of cerebral vascular hemodynamic indexes was under 75 in ROC curve analyses.

结果经过绘制受试者工作特征（ROC）曲线，血液动力学检测预警卒中的最佳积分值截断点应为75分以下。

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