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. Author manuscript; available in PMC: 2023 Mar 21.
Published in final edited form as: Environ Int. 2019 Nov 8;134:105228. doi: 10.1016/j.envint.2019.105228

Table 1:

Percent of seeds captured and number of studies returned by algorithm.

Algorithm Number of Clusters Used Percent of Seeds Captured Number of Studies to Screena
KM-10 1 58% 4,157
NMF-10 1 44% 2,829
KM-20 1 54% 3,011
NMF-20 2 57% 5,145
KM-30 1 31% 1,249
NMF-30 2 38% 3,455
Total Unique 66% 6,691
a

A given study might appear more than once. KM = k-means algorithm, NMF = nonnegative matrix factorization, numbers in algorithm column indicate number of clusters (e.g., KM-10 = k-means algorithm with 10 clusters, KM-20 = k-means algorithm with 20 clusters).