Scientific Investigations Report 2007–5117
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117
Table 16. Akaike weights and supporting variables for evaluating the minimum July–August dissolved-oxygen concentration at Midnorth, Upper Klamath Lake, 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 | K | RSS | AICc | ∆i | e(-0.5*∆i) | wi |
|---|---|---|---|---|---|---|
| Peak chlorophyll-a concentration | 3 | 43.1 | 23.7 | 4.4 | 0.11 | 0.07 |
| Degree–days from April 1 to May 15 | 3 | 43.2 | 23.7 | 4.4 | .11 | .07 |
| 75th-percentile water temperature | 3 | 33.3 | 19.3 | .0 | 1.00 | .62 |
| Cumulative October-May Williamson River discharge | 3 | 43.2 | 23.7 | 4.4 | .11 | .07 |
| Median monthly wind speed | 3 | 42.8 | 23.6 | 4.3 | .12 | .07 |
| Median monthly lake level | 3 | 40.9 | 22.8 | 3.5 | .17 | .11 |
| Remove “best fit” model and reanalyze | ||||||
| Peak chlorophyll-a concentration | 3 | 43.1 | 23.7 | 0.9 | 0.65 | 0.18 |
| Degree–days from April 1 to May 15 | 3 | 43.2 | 23.7 | .9 | .63 | .18 |
| 75th-percentile water temperature | – | – | – | – | – | – |
| Cumulative October-May Williamson River discharge | 3 | 43.2 | 23.7 | .9 | .63 | .18 |
| Median monthly wind speed | 3 | 42.8 | 23.6 | .8 | .68 | .19 |
| Median monthly lake level | 3 | 40.9 | 22.8 | .0 | 1.00 | .28 |
| Remove “best fit” model and reanalyze | ||||||
| Peak chlorophyll-a concentration | 3 | 43.1 | 23.7 | 0.1 | 0.96 | 0.27 |
| Degree–days from April 1 to May 15 | 3 | 43.2 | 23.7 | .1 | .93 | .26 |
| 75th-percentile water temperature | – | – | – | – | – | – |
| Cumulative October-May Williamson River discharge | 3 | 43.2 | 23.7 | .1 | .93 | .26 |
| Median monthly wind speed | 3 | 42.8 | 23.6 | .0 | 1.00 | .28 |
| Median monthly lake level | – | – | – | – | – | – |
U.S. Department of the Interior | U.S. Geological Survey
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