Scientific Investigations Report 2007–5117
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117
Table 15. Akaike weights and supporting variables for evaluating the percentage of pH values greater than 9.7, 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 | 4,418.0 | 102.4 | 3.6 | 0.17 | 0.08 | 3 | 1,484.3 | 83.8 | 1.1 | 0.57 | 0.20 | |
| Degree-days from April 1 to May 15 | 3 | 4,370.4 | 102.2 | 3.4 | .18 | .09 | 3 | 1,526.9 | 84.3 | 1.6 | .44 | .16 | |
| 75th-percentile water temperature | 3 | 3,579.9 | 98.8 | .0 | 1.00 | .48 | 3 | 1,388.1 | 82.7 | .0 | 1.00 | .35 | |
| Cumulative October–May Williamson River discharge | 3 | 4,295.8 | 101.9 | 3.1 | .21 | .10 | 3 | 1,549.9 | 84.6 | 1.9 | .39 | .14 | |
| Median monthly wind speed | 3 | 4,058.9 | 100.9 | 2.1 | .34 | .17 | 3 | 1,695.0 | 86.1 | 3.4 | .18 | .06 | |
| Median monthly lake level | 3 | 4,434.5 | 102.4 | 3.6 | .16 | .08 | 3 | 1,636.5 | 85.5 | 2.8 | .25 | .09 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | 3 | 4,418.0 | 102.4 | 1.4 | 0.49 | 0.16 | 3 | 1,484.3 | 83.8 | 0.0 | 1.00 | 0.31 | |
| Degree-days from April 1 to May 15 | 3 | 4,370.4 | 102.2 | 1.3 | .53 | .17 | 3 | 1,526.9 | 84.3 | .5 | .79 | .24 | |
| 75th-percentile water temperature | – | – | – | – | – | – | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | 3 | 4,295.8 | 101.9 | 1.0 | .62 | .20 | 3 | 1,549.9 | 84.6 | .7 | .69 | .21 | |
| Median monthly wind speed | 3 | 4,058.9 | 100.9 | .0 | 1.00 | .32 | 3 | 1,695.0 | 86.1 | 2.3 | .32 | .10 | |
| Median monthly lake level | 3 | 4,434.5 | 102.4 | 1.5 | .47 | .15 | 3 | 1,636.5 | 85.5 | 1.7 | .44 | .13 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | 3 | 4,418.0 | 102.4 | 0.5 | 0.79 | 0.23 | – | – | – | – | – | – | |
| Degree-days from April 1 to May 15 | 3 | 4,370.4 | 102.2 | .3 | .86 | .25 | 3 | 1,526.9 | 84.3 | 0.0 | 1.00 | 0.35 | |
| 75th-percentile water temperature | – | – | – | – | – | – | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | 3 | 4,295.8 | 101.9 | .0 | 1.00 | .29 | 3 | 1,549.9 | 84.6 | .3 | .88 | .31 | |
| Median monthly wind speed | – | – | – | – | – | – | 3 | 1,695.0 | 86.1 | 1.8 | .41 | .14 | |
| Median monthly lake level | 3 | 4,434.5 | 102.4 | .5 | .76 | .22 | 3 | 1,636.5 | 85.5 | 1.2 | .55 | .19 | |
| Remove “best fit” model and reanalyze | |||||||||||||
| Peak chlorophyll-a concentration | – | – | – | – | – | – | – | – | – | – | – | – | |
| Degree-days from April 1 to May 15 | – | – | – | – | – | – | – | – | – | – | – | – | |
| 75th-percentile water temperature | – | – | – | – | – | – | – | – | – | – | – | – | |
| Cumulative October–May Williamson River discharge | – | – | – | – | – | – | – | – | – | – | – | – | |
| Median monthly wind speed | – | – | – | – | – | – | 3 | 1,695.0 | 86.1 | 0.6 | 0.74 | 0.43 | |
| Median monthly lake level | – | – | – | – | – | – | 3 | 1,636.5 | 85.5 | .0 | 1.00 | .35 | |
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