Package: douconca
Type: Package
Title: Double Constrained Correspondence Analysis for Trait-Environment
        Analysis in Ecology
Version: 1.2.2
Authors@R: c(person(given = "Cajo J.F", 
                    family = "ter Braak", 
                    email = "cajo.terbraak@wur.nl",
                    role = "aut", 
                    comment = c(ORCID = "0000-0002-0414-8745")),
            person(given = "Bart-Jan", 
                   family = "van Rossum", 
                   email = "bart-jan.vanrossum@wur.nl", 
                   role = c("aut", "cre"),
                   comment = c(ORCID = "0000-0002-8673-2514")))
Description: Double constrained correspondence analysis (dc-CA)
        analyzes (multi-)trait (multi-)environment ecological data by
        using library vegan and native R code. Throughout the two step
        algorithm of ter Braak et al. (2018) is used. This algorithm
        combines and extends community- (sample-) and species-level
        analyses, i.e. the usual community weighted means (CWM)-based
        regression analysis and the species-level analysis of
        species-niche centroids (SNC)-based regression analysis. The
        two steps use canonical correspondence analysis to regress the
        abundance data on to the traits and (weighted) redundancy
        analysis to regress the CWM of the orthonormalized traits on to
        the environmental predictors. The function dc_CA has an option
        to divide the abundance data of a site by the site total,
        giving equal site weights. This division has the advantage that
        the multivariate analysis corresponds with an unweighted
        (multi-trait) community-level analysis, instead of being
        weighted. The first step of the algorithm uses vegan::cca. The
        second step uses douconca::wrda but vegan::rda if the site
        weights are equal. This version has a predict function. For
        details see ter Braak et al. 2018
        <doi:10.1007/s10651-017-0395-x>.
URL: https://github.com/CajoterBraak/douconca
BugReports: https://github.com/CajoterBraak/douconca/issues
Depends: R (>= 3.5.0)
License: GPL-3
Encoding: UTF-8
LazyData: true
Imports: ggplot2 (>= 3.5.0), ggrepel, gridExtra, permute, rlang, stats,
        vegan
RoxygenNote: 7.3.2
NeedsCompilation: no
Suggests: knitr, rmarkdown, tinytest
VignetteBuilder: knitr
Repository: https://cajoterbraak.r-universe.dev
Date/Publication: 2025-01-09 14:19:17 UTC
RemoteUrl: https://github.com/CajoterBraak/douconca
RemoteRef: HEAD
RemoteSha: 6c94e4a7f524dd38a3b2c8b06b5fade61779dc04
Packaged: 2026-06-07 08:28:43 UTC; root
Author: Cajo J.F ter Braak [aut] (ORCID:
    <https://orcid.org/0000-0002-0414-8745>),
  Bart-Jan van Rossum [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-8673-2514>)
Maintainer: Bart-Jan van Rossum <bart-jan.vanrossum@wur.nl>