null adj. 1.無效力的,無束縛力的。 2.無效的,無用的,無益的;無價值的。 3.沒特征[個性]的,沒表情的。 4.〔罕用語〕不存在的,沒有的;零(位)的;空的。 n. 【數(shù)學(xué)】零,零位;空;【無線電】零訊號,微弱訊號。 a null indicator 零示器;零位指示器。 the null method 衡消法。 null and void 【律】無效;失效(This check is null and void. 本支票無效)。 vt. 使無效。
correlation n. 相互關(guān)系,相關(guān)(性);對比;交互作用;【數(shù)學(xué)】對射,異射。 correlation index 關(guān)聯(lián)指數(shù)。 correlation mineral 對比礦物。
The distribution and structure of the allelic polymorphism data are analyzed and it is pointed out that the distribution of allelic polymorphism data reveals the characteristic of closed data ( also named as compositional data or data of constant sum ) it is interpreted that the correlation structure of the allelic polymorphism data contains null correlations introduced by " closure " and the statistical distribution of the data is not normal because of its constant row sum , which resulted in great difficulties in analyzing the data with traditional multiple linear statistical methods such as principal component analysis , factor analysis , cluster analysis and canonical correlation analysis 摘要長期以來,對于多維基因多態(tài)性數(shù)據(jù)的多元統(tǒng)計分析,如計算遺傳距離時所用的聚類分析、分析群體遺傳結(jié)構(gòu)時所用的主成分分析、因子分析和典型相關(guān)分析等,一直應(yīng)用為無約束條件數(shù)據(jù)而設(shè)計的經(jīng)典多元線性分析方法,并沒有注意基因多態(tài)性數(shù)據(jù)的“閉合效應(yīng)”所帶來的問題。