Phosphorus and the Kawartha Lakes - Lakefield Herald

Results - Multiple Regression Model
The four variables resulting in the highest significant r 2 value (p = 0.026, r 2 =
0.90) using a standard least squares multiple regression model were; mean depth,
freshwater marsh, pasture/abandoned fields, and cropland (Figure 4.2). See appendix C
for full description of statistical output.
22.5
20
17.5
Actual TP (ug/l)
15
12.5
10
7.5
r 2 = 0.90
P = 0.026
7.5 10.0 12.5 15.0 17.5 20.0 22.5
Predicted T P (ug/l)
Figure 4.2 Multiple regression predictive model of phosphorus concentrations
constructed using the following four environmental predictors; mean depth, freshwater
marsh, pasture/abandoned fields, and cropland. Dashed lines delineate 95% confidence
intervals.
16