Figure 3.

Absolute differences between true and estimated correlation coefficients, $|{\sigma }_{jk}-{\hat{\sigma }}_{jk}|$, for four methods: SPR correlation estimation on quantitative data (green), SPR correlation estimation on mclr_ε-transformed compositional data (brown), SparCC estimation (Friedman and Alm, 2012) (purple), and Pearson sample correlation on clr-transformed data (red) [as used in SPIEC-EASI (Kurtz et al., 2015)].