葉形の数値表現の基となる標本計測の必要数

概要

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The minimum sample size to construct a reliable numerical database of leaf shape was surveyed with the mass-collected leaves of Quercus myrsinaefolia measured through an automated measuring system. The distribution mode of sample data in length, width and margine length is proved to be normal distribution (Fig. 1). The sample mean of leaf length gradually converges to the population mean from the larger side as the measurement is going on because the operator used to start to pick up larger samples when he/she is unconcerned about sampling procedure. Fluctuation of sample mean is being less affected by additional data after the sample size exceeds ca. 100 of a population consists of about 200 samples (Fig. 2A). When the samples are selected randomly, the minimum sample size is attained at ca. 50 samples (Fig. 2C & D).
国立科学博物館の論文