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Technical Specifics for Analysis and Reporting
This information supports GRTS designs, computational options, and analysis software. The software packages are written in S-Plus and R languages (R is a free statistical package). See R Version Compatability Notice.
CDF Estimators, CDF Variance Estimators, S-Plus and R Software, Example R files, Relative Risk
R Statistical Software: The EMAP Design Team has not verified that the current versions of psurvey.design (2.2.1) or psurvey.analysis (2.9) are compatable with the several versions of the R Statistical Software. The Team has developed and executed these packages using R 2.2.1. Use of R version 2.2.1 is highly recommended and is available for download from this website.
An illustrative example, for the adjustment of site weights and estimation of CDF's is presented for Indiana Streams and Coastal Estuaries. Example includes documentation, data files, R procedures, intermediate and results files.
Method Manual: EMAP Statistical Methods Manual (Note: Appendix A has been incorporated into the FAQ pages (survey designs, survey sampling, and data analysis). Appendix B & C have been superceded and are no longer relevant. The Users Guide for psurvey.analysis provides the general framework for statistical estimation. Also see: Stevens and Olsen
Cumulative Distribution Function Estimators
| CDF-1: Proportion; Discrete/Extensive; Horvitz-Thompson (pdf 148KB) |
| CDF-2: Total; Discrete; Horvitz-Thompson (pdf 147KB) |
| CDF-3: Size-Weighted Proportion; Discrete; Horvitz-Thompson (pdf 150KB) |
| CDF-4: Size-Weighted Total; Discrete; Horvitz-Thompson (pdf 153KB) |
| Downloand CDF-1-4 (zip 547 KB) |
Population Estimation Algorithms
User Guides
| Users Guide for psurvey.analysis, version 2.9 Probability Survey Data Analysis Functions (12/31/05) | Download UserGuide (pdf 79KB, 14 pp) |
| R Users Guide for R psurvey.analysis, version 2.9 Probability Survey Data Analysis Functions (12/31/05) | Download R Guide 2.9 (pdf 16KB) |
| Users Guide for S-PLUS psurvey.analysis, version 2.9 Probability Survey Data Analysis Functions (12/31/05) | Download S_PLUS Guide 2.9 (pdf 7KB) |
| Changes2.9, psurvey.analysis Version 2.9 (12/31/05) | Download changes2.9 (pdf 12 KB) |
| Relative Risk, computes the relative risk estimate for a 2x2 table |
Software Downloads for R and S-PLUS
| R Introduction Example | R Script, Data, Annotated R Session Text (zip 212 KB) |
| Stream Example | Stream Length, includes DesignFile, SiteEvalFile, R text files, Results (zip 115 KB) |
| Estuary Example | Estuarine Area, includes two sub-populations, Openwater & Tidal Creeks (zip 39 KB) |
| Wadeable Stream Example | EPA Region 10, EMAP West Wadeable Stream Data, R script, results (zip 39 KB) |
Return to: Top of Page Indiana Stream Example Estuaries Example Wadeable Stream Example
D. L., Jr. Stevens and Olsen, A. R. (2004) Spatially Balanced Sampling of Natural Resources. Abstract Document