TABLE 2.

Linear regression of insolation and log E. coli concentrations in lake watera

Result for date (mo/day/yr)Result at water depth:
45 cm90 cm
RBSEβtSignificanceRBSEβtSignificance
6/12/00
    Intercept3.5610.24114.7770.0003.1840.27111.7420.000
    Insolation (MJ/m2)−0.648−1.240.552−0.648−2.2480.059−0.532−1.0320.621−0.532−1.6620.140
7/11/00
    Intercept3.3460.06750.0890.0003.2270.05657.1620.000
    Insolation (MJ/m2)−0.945−0.3360.044−0.945−7.6660.000−0.971−0.3950.037−0.971−10.6570.000
7/24/00
    Intercept2.0710.09920.960.0002.1350.09422.740.000
    Insolation (MJ/m2)−0.674−0.1060.044−0.674−2.4140.046−0.935−0.2890.042−0.935−6.9520.000
8/01/00
    Intercept2.1790.08924.4540.0002.0710.08524.340.000
    Insolation (MJ/m2)−0.434−0.080.063−0.434−1.2740.243−0.524−0.0970.06−0.524−1.6290.147
8/07/00
    Intercept4.0940.25715.920.0003.5520.25413.990.000
    Insolation (MJ/m2)−0.897−0.6750.126−0.897−5.3590.001−0.898−0.6730.124−0.898−5.4110.001
8/16/00
    Intercept3.6240.09538.0880.0003.290.11927.7010.000
    Insolation (MJ/m2)−0.976−0.5540.046−0.976−11.9190.000−0.943−0.4360.058−0.943−7.5120.000
9/18/00
    Intercept2.3370.08128.7910.0002.1070.07528.2370.000
    Insolation (MJ/m2)−0.918−0.1910.031−0.918−6.1150.000−0.931−0.1940.029−0.931−6.750.000
9/25/00
    Intercept2.0670.07826.3780.0001.7880.09518.7810.000
    Insolation (MJ/m2)−0.292−0.1190.148−0.291−0.8060.447−0.082−0.0390.18−0.082−0.2170.835
  • a Note that only 8 of the 10 sampled days are represented: pyrenometer readings were unavailable on 25 May and 26 June. Significant relationships are in bold.