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Research reports for the salmon_culverts repository.

1. Spending and Activity for Pacific Northwest Salmon Habitat Restoration: A summary of the PNSHP data
   
2. Culvert Projects Summary: A summary of where and when culvert projects occur in the PNSHP data
   
3. Culvert Cost Pilot Models: A first-cut attempt to model culvert costs using just the PNSHP data
   
4. Summary of Spatially Derived Variables for Culvert Projects: A summary of the additional explanatory variables gathered for cost models
   
5. Culvert Cost Models with Spatially Explicit Data: An expansion of the early cost models with data gathered from geospatial databases
   
6. Culvert Cost Models with Spatial Econometric Methods: Builds on the base cost models with methods from the spatial econometrics literature
   
7. Culvert Cost Models with Machine Learning Methods: Compares predictive performance between base OLS method and a suite of regression-tree based machine learning methods