chapter  9
38 Pages

Quality Assurance/ Quality Control: What Does It Reveal about the Reliability of the Rapid Bioassessment Protocol?

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).