When some alleles have very low frequency in the gene frequency matrix, there would be "horse-shoe effect" in the Scallergram of correspondent analysis.
当基因频率矩阵中存在稀有基因时，其对应分析的散点图则呈现明显的“蹄型效应”。
HRR analysis did not show a significant difference in the allelic(A and G) frequency of PLA2G4A gene between transmit and untransmit(P>0.05);
单倍型相对风险分析（HRR）结果显示，传递和未传递的等位基因A、G的频数分布病例组与对照组比较差异无显著性（P>0.05）；
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