NRSA_2009

A dataset containing attributes for Western Mountains Ecoregion rivers and 
streams sampled by the U.S. Environmental Protection Agency (EPA) during the
National Rivers and Streams Assessment (NRSA) surveys for 2004-2006 and
2008-2009.

These functions provide procedures for selecting sites for spatial
surveys using spatially balanced algorithms applied to discrete points,
linear networks, or polygons. The probability survey designs available
include independent random samples, stratified random samples, and unequal
probability random samples (categorical or probability proportional to
size). Design-based estimation based on the results from surveys is
available for estimating totals, means, quantiles, CDFs, and linear models.
The analyses rely on package survey for most results. Variance estimation
options include a local neighborhood variance estimator that is appropriate
for spatially-balanced survey designs. A reference for the survey design
portion of the package is: D. L. Stevens, Jr. and A. R. Olsen (2004),
"Spatially-balanced sampling of natural resources.", Journal of the American
Statistical Association 99(465): 262-278, <DOI:10.1198/016214504000000250>.
Additional helpful references for this package are A. R. Olsen, T. M.
Kincaid, and Q. Payton (2012) and T. M. Kincaid and A. R. Olsen (2012), both
of which are chapters in the book "Design and Analysis of Long-Term
Ecological Monitoring Studies" (R. A. Gitzen, J. J. Millspaugh, A. B.
Cooper, and D. S. Licht (eds.), Cambridge University Press, New York,
<Online ISBN:9781139022422>).

Tom Kincaid

spsurvey

Spatial Survey Design and Analysis

Tony Olsen

Don Stevens

Christian Platt

Denis White

Richard Remington

NRSA_2009 function

A data frame with 668 rows and 13 variables:<dl class="dl-horizontal">
 <dt>siteID</dt><dd>site ID value.</dd>
 <dt>xcoord</dt><dd>Albers projection x-coordinate.</dd>
 <dt>ycoord</dt><dd>Albers projection y-coordinate.</dd>
 <dt>wgt</dt><dd>survey design weight.</dd>
 <dt>Survey</dt><dd>survey identifier, which is either WSA or NRSA.</dd>
 <dt>Revisit_Site</dt><dd>identifier of revisit sites for the two surveys, where
 Y = a revisit site and N = not a revisit site.</dd>
 <dt>Stream_Size</dt><dd>stream size category, which is either large or small.</dd>
 <dt>NTL</dt><dd>total nitrogen concentration.</dd>
 <dt>PTL</dt><dd>total phosphorus concentration.</dd>
 <dt>Benthic_MMI</dt><dd>value of the benthic macroinvertebrate multimetric index
 (MMI).</dd>
 <dt>NTL_Cond</dt><dd>condition class category of the total nitrogen value.</dd>
 <dt>PTL_Cond</dt><dd>condition class category of the total phosphorus value.</dd>
 <dt>Benthic_MMI_Cond</dt><dd>condition class category of the benthic MMI value.</dd>
</dl>

Format

Western Mountains Ecoregion Rivers and Streams — NRSA_2009

A data frame with 668 rows and 13 variables:<dl class='dl-horizontal'>
 <dt>siteID</dt><dd>site ID value.</dd>
 <dt>xcoord</dt><dd>Albers projection x-coordinate.</dd>
 <dt>ycoord</dt><dd>Albers projection y-coordinate.</dd>
 <dt>wgt</dt><dd>survey design weight.</dd>
 <dt>Survey</dt><dd>survey identifier, which is either WSA or NRSA.</dd>
 <dt>Revisit_Site</dt><dd>identifier of revisit sites for the two surveys, where
 Y = a revisit site and N = not a revisit site.</dd>
 <dt>Stream_Size</dt><dd>stream size category, which is either large or small.</dd>
 <dt>NTL</dt><dd>total nitrogen concentration.</dd>
 <dt>PTL</dt><dd>total phosphorus concentration.</dd>
 <dt>Benthic_MMI</dt><dd>value of the benthic macroinvertebrate multimetric index
 (MMI).</dd>
 <dt>NTL_Cond</dt><dd>condition class category of the total nitrogen value.</dd>
 <dt>PTL_Cond</dt><dd>condition class category of the total phosphorus value.</dd>
 <dt>Benthic_MMI_Cond</dt><dd>condition class category of the benthic MMI value.</dd>
</dl>

NRSA_2009: Western Mountains Ecoregion Rivers and Streams

Description

Usage

Arguments

Format