TABLE 1.

Summary information for the two selected published data sets, including the number and percentage of operational taxa assigned to the core by each method tested^a

Characteristic	Data set
	Human Microbiome Project	Arabidopsis thaliana microbiome
Total taxa	11,752	14,890
Total reads	1,893,867	1,770,731
Total samples	319	288
NCBI accession no.	HM16STR	ERP001384
Sequencing platform	Illumina	454
Method	Taxa assigned to core, n (%)
Abundance-based	1,108 (9.42)	1,245 (8.36)
Occupancy-based	204 (1.73)	1,134 (7.61)
Abundance and occupancy-based	204 (1.73)	907 (6.09)
Hard cutoffs of abundance and occupancy	554 (4.71)	181 (1.21)
Not assigned to the core by any method	10,642 (90.55)	13,590 (91.26)
Unique taxa assigned to the core by any method	1,110 (9.44)	1,300 (8.73)

^aThe Arabidopsis thaliana data set was generated by Lundberg et al. (10) and only utilizes rhizosphere samples from the M21 site. The human microbiome data set was generated by the Human Microbiome Consortium (53) and includes only fecal samples.