The function of rarefaction analysis, which can be used to get an idea if the sequencing depth is good enough, seems to be unavailable in the QIIME 2. Why is that?
Hey @yanxianl,
That functionality is actually in progress as we speak! Look for it in the next few releases!
The QIIME 2 2017.8 release is live and includes a new qiime diversity alpha-rarefaction visualizer! 