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1 <br />' forward: coefficient R, represents a test for effects due to exposure to selenium; RZ represents a <br />test for effects from fish species. <br />Analysis of fish growth in the ELS test was conducted using a similar methodology. <br />Proc Genmod (with options link=identity, dist=normal; SAS 1993) was used to describe the <br />response of fish mass and total length as a function of dissolved selenium concentration and fish <br />species. The full regression model had the form <br />y=Ro+R~x~+Rzxz+R3x~xz <br />where y =fish mass (mg) or total length (mm) and other parameters and variables are the same as <br />described above. <br />Estimates of 96-hour median lethal concentrations for razorback sucker, flannelmouth <br />sucker, and fathead minnow in acute studies were obtained using Proc Probit (SAS 1990). <br />Transformations (log,o) were used if they improved the fit of regression models. Graphical <br />analyses of data and residual plots were conducted to confirm that regression models were <br />appropriate and to evaluate compliance with statistical assumptions. <br />11 <br />