Regression trendline of one land-cover class through time

Fits a regression of a single land-cover class (or conservation group) percentage of area against year and plots the observed points with the fitted curve, its equation, R-squared and p-value. When the ggtrendline package is installed (https://CRAN.R-project.org/package=ggtrendline) it is used to draw the trendline and annotate the statistics; otherwise the function falls back to a plain ggplot2 linear fit carrying the same statistics, and finally to base graphics.

Usage

plot_class_trendline(
  ts,
  class_label = NULL,
  model = "line2P",
  title = NULL,
  lang = c("en", "pt")
)

Arguments

ts: A long data frame from cover_timeseries or timeseries_for_species.
class_label: The label (class or group name) to analyse. When NULL (default), the class with the largest mean percentage across the series is used.
model: ggtrendline model, one of "line2P" (linear, default), "line3P" (quadratic), "log2P", "exp2P", "exp3P", "power2P" or "power3P". Ignored (a linear fit is used) when ggtrendline is not installed.
title: Optional plot title. When NULL, a title is built from the class name and the species/range attributes when present.
lang: Axis/title language: "en" (default) or "pt". When "en" the English MapBiomas class names (class_en) are used when available.

Value

A ggplot object when ggplot2 is available; otherwise NULL (invisibly) after drawing a base plot.

Usage

Arguments

Value

See also