The Model

from Kristie, delta-DO from SBCK and flow from SBCK, USGS and Ventura County gauging records). The regression relationship used in the model is shown on the graph (p < 0.001, rsquared = 0.81). On the chart, plotted in green and blue, are the data used to derive the equation; the identifying numbers show the SBCK site codes, followed by measured mean Chl-a densities. By comparing actual measured Chl-a density with the model’s lines of equal density plotted on the graph (the red numbers indicate Chl-a in mg/m) the accuracy of the model can be judged. In my opinion it does a reasonable job, but one with a large associated error – a large error, in spite of a very high r-square value, being typical for a variable extending over a range of almost three ordersof-magnitude estimated from a log or semi-log regression equation.