Regulation Effect of a Chinese Herbal Formula on Flora and Mucosal Immune Secretory Immunoglobulin A in Rats

Figure 7

Results of RDA/CCA analysis. RDA/CCA is a ranking method based on correspondence analysis, which is mainly used to reflect the relationship between flora and environmental factors. The angles between environmental factors indicate positive and negative correlation between environmental factors (acute angle: positive correlation; obtuse angle: negative correlation; right angle: no correlation). As indicated by the vertical projection points of different samples on various environmental factors, the closer the distance between the vertical projection points is, the more similar the environmental factor among different samples is, indicating that the degrees of the influences of the environment factor on different samples are similar.