NMDS plot for Amplicon 16s OTU count

Question

[Bioinfonext]

I used below code to generate NMDS plot, but I used here raw OTU count as input.

prev.ordNMDS_data1 <- ordinate(data1_prev_norm, "NMDS", "bray") plot_ordination(data1_prev_norm,

ordination = prev.ordNMDS_data1, color="Region") + theme_minimal() + geom_point(size=5)

For NMDS, rank-threshold transformation is recommended as input, but I do not know how to it. I will thankful for your help and time to help me with this.

How to do rank threshold transformation for OTU count?

I tried the below code but it shows error in phyloseq:

Error

> ntaxa(mymensingh_all)
[1] 44481
> abund <- otu_table(mymensingh_all)
> abund_ranks <- t(apply(abund, 1, rank))
> abund_ranks <- abund_ranks - 20000
> abund_ranks[abund_ranks < 1] <- 1
> prev.ordNMDS_rank <- ordinate(abund_ranks, "NMDS", "bray") 
Error in ordinate(abund_ranks, "NMDS", "bray") : 
  Expected a phyloseq object or otu_table object.

[Bioinfonext]

For NMDS, rank-threshold transformation is recommended, but I do not know how to it. I will thankful for your help and time to help me with this.

How to do rank threshold transformation for OTU count at a?

Thanks