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Ross最近在一篇棱镜轮尺的应用的短文中,再次提出比较用直径卷尺和用轮尺测得的树木直径和断面积的问题。他表示要澄清两个重要论点: 1.用直径卷尺量测产生的断面积估计偏差比用轮尺量测的偏大,可能不是一个既定结论。 2.用一把轮尺从任一量测方向量取树木直径的样本平均数,完全比得上用卷尺量测同样直径的平均数。关于第一个论点,Ross这样引用了Mc-Ardle(1926)的话:“发现直径卷尺一直产
In an essay on the application of prism caliper, Ross recently put forward the question of comparing the diameter of a tree and the area of a tree measured with calipers again. He said that there are two important points to clarify: 1. It is probably not a definitive conclusion that the estimation bias of cross-sectional area measured with a tape measure is larger than that measured with a caliper. 2. Use a caliper to measure the mean diameter of the trees from either direction and measure the average of the same diameter with a tape measure. On the first argument, Ross quoted Mc-Ardle (1926) as saying: "It has been found that diameter tape measure has been produced