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Stepwise multiple
regression, explanatory variables best-fit model (p £
0.05) according to incidence rates, 1990-94, 1991-95, 1993-97 and
1994-98. Step 1 2 3 4 Constant 105.2 182.8 185.2 182.7 Ave. Temp 0.026 0.055 0.130 0.171 T-Value 0.40 1.00 2.34 3.07 P-Value 0.690 0.317 0.020 0.003 Elevation -0.00128 0.00033 0.00050 0.00073 T-Value -3.29 0.84 1.34 1.98 P-Value 0.001 0.402 0.183 0.050 Low Ave. Temp -0.93 -1.04 -1.05 T-Value -7.86 -8.94 -9.30 P-Value 0.000 0.000 0.000 Water/Land Ratio 13.7 27.2 T-Value 3.98 4.88 P-Value 0.000 0.000 Water Area -0.00014 T-Value -3.03 P-Value 0.003 S 8.75 7.37 7.03 6.84 R-Sq 6.79 34.25 40.64 44.15 R-Sq (adj) 5.53 32.92 39.02 42.24 |