The following are R script (.R) files for applying the weights (found in the site information file) in order to appropriately develop population estimates for the National Wetland Condition Assessment (NWCA) Campus Research Challenge. To run the R scripts provided here, students will need to install the spsurvey package.Exit Note: Installation of spsurvey from the CRAN web site will result in installation of other packages required by spsurvey that are not already installed. The NWCA Campus Research Challenge Application can also be found below. If you have any questions, please contact EPA staff at NARS-challenge@epa.gov.

Attributable Risk Estimates(1 pg, 6 K)

Relative Risk Estimates(1 pg, 6 K)

Cumulative Distribution Function Estimates(1 pg, 4 K)

Condition Estimates(1 pg, 5 K)

Extent Estimates(1 pg, 4 K)

• NWCA Campus Challenge Application Form (PDF)(2 pp, 378 K)