Metrics compilation and boundaries setting Sample Clauses

Metrics compilation and boundaries setting. ‌ For integration of a metric in a multi metric index (MMI), the criterion to be met is the non redundancy of the latter. Most studies used a correlation test as an indicator of redundancy (Xxxxxx et al. 2004, Xx Xxxxxxx et al. 2001 and Oberdorff et al. 2002). A xxxxxxxx’x rank correlation test was then performed to identify these metrics. Compilation of metrics to build an index could be done by different ways, but here as first convenient approach, we chose a simple addition of the core metrics (expressed in EQR). Two methods were used to set the H/G boundary: the index value on reference sites was selected and also the index response to the pressure gradient. Tests were performed with different lake percentile of index distribution: 10, 15 or 20%. For all other boundaries, 2 methods were also used: by making 4 homogeneous groups for values below H/G boundary or by clustering method (here k-means algorithm).