Venn diagrams are used to show the mathematical or logical connections between different groups of things, and are especially suitable for representing the general relationship between sets or classes. They are also often applied to help derive some laws about set operations.
In the microbial population analysis, for data with fewer groups (less than or equal to 5), you can draw a Venn diagram to statistically analyze the species and numbers of unique or common species among different sample groups, and visually display the similarity and overlap of species composition among sample groups. In the Venn diagram, the number in each petal represents the number of species unique to the corresponding group, and the sum of the numbers in each circle represents the total number of species in the group. In general, an OTU with a similar level of 97% is selected for analysis.
Fig.1 Venn diagrams showing the distribution of bacterial/archaeal and fungal measurable OTUs associated with Cacti by plant compartment. (Fonseca C, et al. 2016)
Under the OUT of 97% similarity, the R language tool is used for statistics and drawing.
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