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On the recordRead 5 Oct 202614 facts
SSN2
On the record
- Data handling
- SSN2 imports stream edges, observed sites, and optional prediction sites from a non-proprietary .ssn folder.usepa.github.io · read 5 Oct 2026
- Dependencies
- SSN2 imports sf for spatial data handling and spmodel for modeling functions, among other R packages.usepa.github.io · read 5 Oct 2026
- Diagnostics
- Available functions include model augmentation, influence diagnostics, leave-one-out cross-validation, and fitted-model diagnostic plots.usepa.github.io · read 5 Oct 2026
- Installation
- The site documents installation from CRAN and GitHub.usepa.github.io · read 5 Oct 2026
- Intended use
- The package is designed for users fitting spatial stream network models to stream data, such as modeling stream phenomena and predicting values across a network.usepa.github.io · read 5 Oct 2026
- License
- The project is licensed under the GNU General Public License, GPL-3.usepa.github.io · read 5 Oct 2026
- Mapping
- The package includes mapping and other graphical functions, and its introduction uses ggplot2 and sf for visualizations.usepa.github.io · read 5 Oct 2026
- Modeling
- It fits spatial linear models, including explanatory variables, using restricted or unrestricted maximum likelihood.usepa.github.io · read 5 Oct 2026
- Model types
- It supports linear and generalized linear spatial stream network models.usepa.github.io · read 5 Oct 2026
- Predictions
- The package fits and summarizes spatial stream network models and predicts at unobserved locations (Kriging).usepa.github.io · read 5 Oct 2026
- Preprocessing
- The documentation recommends the SSNbler R package to prepare input data for SSN2.usepa.github.io · read 5 Oct 2026
- Purpose
- SSN2 is an R package for spatial statistical modeling and prediction on stream networks, including models based on in-stream distance.usepa.github.io · read 5 Oct 2026
- Spatial components
- Its models can include tail-up, tail-down, Euclidean, and spatially independent nugget error components.usepa.github.io · read 5 Oct 2026
- Support
- Users can get help by opening a GitHub issue, emailing the SSN support team, or posting on Stack Overflow or Cross Validated.usepa.github.io · read 5 Oct 2026
