一般要比較群落間的物種多樣性時，抽樣資料有兩種型態(個體資料或區塊資料)，本文個體資料的抽樣假設為多項式分配、區塊資料的抽樣假設為白努力乘積模型，但樣本物種數還會受到收集到的樣本數不同的影響，為此回顧稀釋和外插物種曲線的估計方法，將樣本稀釋及外插到相同樣本數下比較物種的相對豐富度，並介紹物種曲線對樣本涵蓋率作圖的概念，在相同樣本涵蓋率下比較群落的物種豐富度大小。
本文主要研究在上述物種曲線估計量，在個體資料和區塊資料下使用傳統拔靴方法計算的標準差所造成低估的問題，以建構較符合母體真實情況的重抽方法，並利用電腦模擬試驗修正方法的表現，並把上述方法寫成操作介面以供研究者使用。

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