ABSTRACT
Relative Percent Difference (RPD) Precision Measures for Raw Metric Values and Standardized Metric Scores ............................................................ 137
Root Mean Square of Error (RMSE) Precision Measures of Raw Metric Values and Standardized Metric Scores ............................................................ 139
Coefficient of Variability (CV) Precision Measures of Raw Metric Values and Standardized Metric Scores ........................................................................ 140
Precision Measures for Bioassessment Scores ...................................................... 142 Comparison of Precision Measures and Discrimination Efficiencies
of Ecoregional and Subecoregional Biotic Indices ........................................... 143 Comparison of Relative Percent Difference by Stream Class Designation ........... 145 Comparison of Relative Percent Difference for Spatial and Temporal
QC Samples ....................................................................................................... 150 References .............................................................................................................. 165
with similar geologic features, soil types, vegetation, and climatic influences will most likely possess similar biological communities (Omernik and Gallant 1990; Hughes 1995; Omernik 1995). This concept is useful in conjunction with bioassessment programs because it can be used to characterize and predict natural variations among systems within similar geographic regions, as well as to detect responses to disturbances based on some reference condition (Hughes and Larsen 1988).
