Regression Model for Explaining and Predicting Concentrations of Dieldrin in Whole Fish from United States Streams
By
Lisa H. Nowell, Charles G. Crawford, Naomi Nakagaki, Gail P. Thelin and David M. Wolock
Table 3
Explanatory variables and coefficients for the regression model for dieldrin in whole fish.
[—, none; lb/mi2, pound per square mile]
| Explanatory variable | Transformation | Coefficient | p-value |
|---|
| Fish lipid content (%) | Logarithmic | 1.0542 | 1.32E–21 |
| Aldrin–dieldrin use in agriculture, per basin area (lb/mi2) | — | 0.0733 | 7.91E–26 |
| Forest land (% of basin) | Square root | –0.0829 | 5.18E–16 |
| Urban-termite score | Logarithmic(x + 1) | 0.5406 | 2.91E–27 |
| Organic matter content of basin soils (average %) | Logarithmic | –0.4838 | 2.94E–10 |
| Southern Plains region | Binary group variable (1/0) | 0.2714 | 0.0146 |
| (Intercept) | — | –0.1674 | 0.132 |