plot_mv: Plot Mean Variance OTU in order to evaluate overdispersion
In cpauvert/psadd: Additions to phyloseq package for microbiome analysis

Description Usage Arguments Details Value References See Also Examples

The mean and variance (var) of physeq OTU table are computed. Overdispersion can be visually assessed by the generated plot. The putative linear relation between mean and variance is added with abline to guide the analysis.

1	plot_mv(physeq, log = TRUE, title = NULL)

`physeq`	`phyloseq-class`
`log`	A `logical` stating whether to apply `log1p` transform to both axis.
`title`	A title to the mean-variance plot

The log1p transform was chosen to limit NaN values with null values.

A ggplot object

Modified from Thorsen and Brejnrod et al. (2016).

taxa_stats

require(phyloseq)
data(GlobalPatterns)
(mv1<-plot_mv(GlobalPatterns, title = "Mean-Variance Plot with log-transform"))
mv1.nolog<-plot_mv(GlobalPatterns,log = FALSE, title = "Mean-Variance Plot without log-transform")