Get performance measures for ASCI using statewide results
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This functions estimates seven performance measures that evaluate index accuracy, precision, and responsiveness for calibration and validation datasets. The following are estimated:
ave Average scores at reference sites
fst F statistic of reference scores between ecoregions
vrs_nat Variance of index scores explained by natural gradients at reference sites
prc_amg Precision among sites as standard deviation of scores at reference sites
prc_wth Precision within sites as standard deviation of within-site residuals for repeat site visits at reference sites
res_tst t-statistic as a measure of precision between scores at reference and stressed sites
res_var Variance of index scores explained by human-activity gradients at all sites as a measure of responsiveness
This function requires site classifications as reference (calibration and validation), stressed, and repeat visits. Regions for each site are also required.
data.frame of performance measures by index, index group (diatoms, soft-bodied algae, hybrid), predicted/null, and reference calibration/validation
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