During compute, ecovalue time series for each selected pairing are combined based on the numeric method chosen by the user. Combined ecovalue time series are then tallied in the same progression (see section 3.6.3) as done for other ecovalue summations: 1) daily combined ecovalue series, 2) tally for flow regime, 3) tally status at the end of each season, 4) tally total for flow regime, 5) tally for each season, 6) tally total for each season, and 7) a ranked set of seasonal totals from #6.
There is an Apply paired data option (Figure 68, see section 6.1) that allows the combined ecovalue series to be multiplied by a paired data set prior to tallying. For multivariate analyses, paired data associated with the host flow regime are applied via this option. The most common application of paired data in multivariate analyses is to multiply the combined ecovalue time series (in terms of suitabilities) by area per flow regime part (paired data) to compute time series of suitable habitat (in terms of area).
Results of multivariate analyses are stored in HDF and DSS and reported in HEC-EFM results tables. All DSS outputs for multivariate analyses are labeled with a c-part that includes “multivariate”.
Two style sheets (see section 5.3) are provided for rendering output tables of multivariate results, “Basic, multivariate only” and “Basic, multivariate only inverted”, the latter of which has flow regimes in rows and relationships in columns and is recommended when rendering multivariate results for numerous flow regimes or flow regime parts.
Figure 74 provides an overview of the compute process and DSS outputs, which are then available for viewing in HEC-EFM Plotter.
Figure 74. Compute process and DSS outputs related to multivariate analyses.