Scientific Investigations Report 2007–5117
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117
Table 14. Akaike weights and supporting variables for evaluating the percentage of dissolved-oxygen concentrations less than 4 milligrams per liter, Upper Klamath and Agency Lakes, Oregon, 1990–2006.
[n=17 for all; K, number of parameters in the model; RSS, residual sum of squares; AICc, Akaike information criterion; ∆i, AICi minus the minimum AICc for the set; wi, Akaike model weight; shading indicates the best fit model for each set]
| Model | July | August | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| K | RSS | AICc | ∆i | e(-0.5*∆i) | wi | K | RSS | AICc | ∆i | e(-0.5*∆i) | wi | ||
| Peak chlorophyll-a concentration | 3 | 795.7 | 73.2 | 6.8 | 0.03 | 0.02 | 3 | 2,207.6 | 90.6 | 4.7 | 0.10 | 0.06 | |
| Degree-days from April 1 to May 15 | 3 | 778.3 | 72.9 | 6.4 | .04 | .02 | 3 | 2,145.6 | 90.1 | 4.2 | .12 | .08 | |
| 75th-percentile water temperature | 3 | 549.3 | 66.9 | .5 | .79 | .39 | 3 | 1,677.5 | 85.9 | .0 | 1.00 | .61 | |
| Cumulative October–May Williamson River discharge | 3 | 673.2 | 70.4 | 3.9 | .14 | .07 | 3 | 2,153.8 | 90.2 | 4.3 | .12 | .07 | |
| Median monthly wind speed | 3 | 534.6 | 66.5 | .0 | 1.00 | .49 | 3 | 2,031.5 | 89.2 | 3.3 | .20 | .12 | |
| Median monthly lake level | 3 | 784.4 | 73.0 | 6.5 | .04 | .02 | 3 | 2,201.4 | 90.5 | 4.6 | .10 | .06 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | 3 | 795.7 | 73.2 | 6.3 | 0.04 | 0.03 | 3 | 2,207.6 | 90.6 | 1.4 | 0.49 | 0.15 | |
| Degree-days from April 1 to May 15 | 3 | 778.3 | 72.9 | 5.9 | .05 | .04 | 3 | 2,145.6 | 90.1 | .9 | .63 | .19 | |
| 75th-percentile water temperature | 3 | 549.3 | 66.9 | .3 | 1.00 | .76 | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | 3 | 673.2 | 70.4 | 3.5 | .18 | .13 | 3 | 2,153.8 | 90.2 | 1.0 | .61 | .19 | |
| Median monthly wind speed | 3 | – | – | – | – | – | 3 | 2,031.5 | 89.2 | .0 | 1.00 | .31 | |
| Median monthly lake level | 3 | 784.4 | 73.0 | 6.1 | .05 | .04 | 3 | 2,201.4 | 90.5 | 1.4 | .50 | .16 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | 3 | 795.7 | 73.2 | 2.8 | 0.24 | 0.13 | 3 | 2,207.6 | 90.6 | 0.5 | 0.78 | 0.22 | |
| Degree-days from April 1 to May 15 | 3 | 778.3 | 72.9 | 2.5 | .29 | .16 | 3 | 2,145.6 | 90.1 | .0 | 1.00 | .28 | |
| 75th-percentile water temperature | – | – | – | – | – | – | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | 3 | 673.2 | 70.4 | .0 | 1.00 | 1.00 | 3 | 2,153.8 | 90.2 | .1 | .97 | .27 | |
| Median monthly wind speed | – | – | – | – | – | – | – | – | – | – | – | – | |
| Median monthly lake level | 3 | 784.4 | 73.0 | 2.6 | .27 | .27 | 3 | 2,201.4 | 90.5 | .4 | .80 | .23 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | 3 | 795.7 | 73.2 | 0.4 | 0.83 | 0.30 | – | – | – | – | – | – | |
| Degree-days from April 1 to May 15 | 3 | 778.3 | 72.9 | .0 | 1.00 | .36 | – | – | – | – | – | – | |
| 75th-percentile water temperature | – | – | – | – | – | – | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | – | – | – | – | – | – | – | – | – | – | – | – | |
| Median monthly wind speed | – | – | – | – | – | – | – | – | – | – | – | – | |
| Median monthly lake level | 3 | 784.4 | 73.0 | .1 | .94 | .34 | – | – | – | – | – | – | |
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