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. Author manuscript; available in PMC: 2015 Apr 2.
Published in final edited form as: Environ Int. 2014 Jun 17;71:13–19. doi: 10.1016/j.envint.2014.05.023

Figure 2.

Figure 2

Selecting the appropriate value of clusters: ratio of the within cluster to between cluster variability in the multivariate pollutant vector (SSW/SSB) for different values of k (number of clusters)