286    ◾    Bioinformatics

qiime feature-table summarize \

--i-table denovo/table-yoga-denovo.qza \

--m-sample-metadata-file data/sample-metadata.tsv \

--o-visualization denovo/table-yoga-denovo.qzv

qiime tools view denovo/table-yoga-denovo.qzv

qiime feature-table summarize \

--i-table dada2/table_yoga_dada2.qza \

--m-sample-metadata-file data/sample-metadata.tsv \

--o-visualization dada2/table_yoga_dada2.qzv

qiime tools view dada2/table_yoga_dada2.qzv

The html report of the feature table visualization, as displayed on the Internet browser

(Figure 7.11), has three tabs: Overview, Interactive Sample Details, and Feature Details

tab. Overview tab contains Table summary, Frequency per sample with a histogram, and

Frequency per feature with a histogram. Interactive Sample Detail tab (Figure 7.12) displays

a plot, a table containing sample IDs and feature counts, and Plot controls to control the

plot interactively by changing Metadata Category using the dropdown list and sampling

depth using Sampling Depth sliding bar. The metadata category list is obtained from the

sample metadata file which describes the sample groups. Feature Details tab (Figure 7.13)

shows the list of the features found in the samples. The table includes feature id, feature

frequency (abundance), and number of samples in which that feature is observed.

The “feature-table summarize” methods are used to visualize any feature tables gener-

ated by any of the clustering or denoising methods.

We can also use “tabulate-seqs” to create a visualization file for the representative

sequence artifact generated by any of the clustering or denoising methods.

FIGURE 7.11  The Stats summary of the feature table.