數量性狀之基因定位的目的是想要尋找影響有興趣之數量性狀的基因座在染色體上之確切位置。近年來，由於分子生物學的快速發展，提供了更多的材料和結果，使得在複雜性狀之基因定位的研究也有長足之進步。在本文中主要提出一個數量性狀分析方法，利用同胞對資料，建立同胞對間數量性狀差之絕對值與標識基因座之同源全等基因的邏輯斯迴歸模型，並應用此邏輯斯迴歸之斜率與截距估計量建立非線性迴歸模型，進而建構出控制數量性狀基因座之估計量與此估計量之信賴區間。透過模擬研究可以發現，同胞對相環境效應的相關係數較高，且遺傳率較高時，此方法的所建構之估計量會越穩建。

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