Elion-Gerritzen W E
Am J Clin Pathol. 1977 Jan;67(1):91-6. doi: 10.1093/ajcp/67.1.91.
A two-sample plot is often used to display test results in clinical chemistry external quality control programs. The use of control materials at different concentrations calls for a re-evaluation of the two-sample plot. A modification of the two-sample plot is presented. The axes of the graph are graduated in units of measurement rather than standard deviation intervals. The mean of all laboratories or a reference laboratory's value is entered as the target value. For each laboratory, repeated results for the same or similar control materials are recorded. Visual inspection of the graph gives immediate information as to the extent of intra-laboratory variability, the incidence of systematic errors in the laboratory, and the size and type of systematic errors (proportional or constant) with respect to the target value.
双样本图常用于临床化学外部质量控制程序中展示测试结果。使用不同浓度的质控材料需要对双样本图进行重新评估。本文提出了双样本图的一种改进方法。该图的坐标轴以测量单位分度，而非标准差区间。所有实验室的均值或参考实验室的值作为目标值输入。对于每个实验室，记录相同或相似质控材料的重复结果。通过对该图的目视检查可立即获得有关实验室内变异程度、实验室系统误差发生率以及相对于目标值的系统误差大小和类型（比例误差或恒定误差）的信息。
