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19kaoyanly

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气质数据分析,主成分分析
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有虫友知道,主成分分析中的loading图显示与任何化合物的相关性至少为0.8的变量的这个图该怎么做吗,怎么用origin在loading图上操作可以得到这种结果吗,有熟悉处理气质数据的虫友可以解答一下吗,苦恼很久了。

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MUSE1997s

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为啥用pca做相关性,直接做不行吗

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12楼2022-01-16 00:37:22
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19kaoyanly

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12楼: Originally posted by MUSE1997s at 2022-01-16 00:37:22
为啥用pca做相关性,直接做不行吗

文献里的这段文字是这么描写的
3.4.2.Prirtcipal component analysisIn an attempt to further understand the difference in the volatileprofile between the traditional sausages and conventional sausages,atotal of 77 significantly different volatiles between two groups of sau-sages were used for the PCA.The PC1 with an eigenvalue of 22.39,PC2with an eigenvalue of 5.58 and PC3 with an eigenvalue of 4.51 explained50.90%,12.68% and 10.25% of the overall variance, respectively. ThePCA plot explains 63.58% of the total variations in the first two di-mensions (Fig. 3). The loading plot (Fig. 3(A)) shows variables whosecorrelation with any of the compounds was at least 0.8 (Halagarda,Kedzior,& Pyrzyriska,2018).As shown in Fig.3(B), the two groups ofsausages were well-differentiated along PC1. The traditional sausages(A, B, C and D varieties) were all distributed on the right side along theaxis, and they were positively correlated with hexanol, furfuryl alcohol,hexanal,furfural,5-methyl furfural,2-methyl-2-cyclopenten-1-one,3-methy1-2-cyclopenten-1-one, 3-ethy1-2-hydroxy-2-cyclopenten-1-one,l-indanone,guaiacol,2-methoxy-4-methylphenol,2,3,5-trimethyphenol,o-cresol,4-ethyl-2-methoxyphenol,2,5-dimethylphenol,2,4-dimethylphenol,2-methoxy-4-propylphenol,octane, naphthalene andheptanoic acid,especially the A variety. The conventional sausages (E,F, G and H varieties) were distributed on the left side and positivelycorrelated with 1-octen-3-ol,2-nonanone and methyl 2-furoate.
然后我找不到操作方法,所以求助一下大家

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13楼2022-01-16 01:17:22
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宋小爷

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我没明白你的意思,你可以粘贴其他文献里的类似的图吗?什么叫“loading图显示与任何化合物的相关性至少为0.8的变量”
14楼2022-01-16 06:49:14
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