Calculating relative abundance

Hi, how do I find and Calculate the relative abundance of each taxonomic level, l have tow group in my samples for example case and control, and if l want to Know What percentage of the control group is firmicutes in phylum level, like below pic

Hi! I am not sure if I understood you correctly, but maybe you should group your feature table by the treatment group and create a barplot on grouped table. So you will have relative abundances for each group and each taxonomy rank

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