Estimate Smooth and Linear Trends from Population Count Survey Data

Functions to estimate and plot smooth or linear population trends, or population indices, from animal or plant count survey data.

poptrend

poptrend is an R package for estimating simple population trends from count survey data using Generalized Additive Mixed Models (GAMM). The package uses mgcv as the model fitting engine and provides methods for plotting trends, and computing indices and estimates of population change.

Installation

CRAN version

The main version of poptrend is available from CRAN and can be installed from R by running

install.packages("poptrend")

Development version

Alternatively, the most recent development version can be installed directly from Github. To do so, first install the devtools package:

install.packages("devtools")

Then run:

library(devtools)
install_github("jknape/poptrend")