Table 1.

Accuracy of K number assignment by KAAS with the BBH method and the whole set of KEGG GENES

Species	H. sapiens	A. thaliana	S. cerevisiae	E. coli
Sensitivity	83.7%	70.4%	85.2%	97.4%
Specificity	98.6%	91.5%	94.1%	94.3%
PPV	93.6%	47.9%	80.7%	94.9%
Precision	98.0%	85.5%	91.6%	98.5%

Sensitivity is the rate of the true positives to all genes with KO annotations. Specificity is the rate of the true negatives to all genes without KO annotations. PPV is the rate of true positives to all positives for all genes in each organism. Precision means the rate of correctly annotated genes if the test set is limited to the genes with KO annotations.