lgpr

R-package for interpretable nonparametric modeling of longitudinal data using additive Gaussian processes. Contains functionality for inferring covariate effects and assessing covariate relevances. Various models can be specified using a convenient formula syntax.

[!NOTE] Using this package is computationally viable if your data set has maybe less than 300 observations. But the much more scalable lgpr2 package has been released! It is much faster but unfortunately doesn't have all the special modeling features included in this package.

Getting started

See overview, tutorials, vignettes and documentation at https://jtimonen.github.io/lgpr-usage/index.html.

Requirements

• The package should work on all major operating systems.
• R 3.4 or later is required, R 4.2 or later is recommended

Installing from CRAN

• The latest released version that is available from CRAN can be installed simply via

  install.packages("lgpr")

  Installing from CRAN is probably the easiest option since they might have binaries for your system (so no need to build the package from source yourself).

Installing from source

• The latest released version (which might not be in CRAN yet) can be installed via

  install.packages('devtools') # if you don't have devtools already
  devtools::install_github('jtimonen/lgpr', build_vignettes = TRUE)

• The latest development version can be installed via

  devtools::install_github('jtimonen/lgpr', ref = "develop")

  Github installations are source installations (they require a C++ compiler).

• If you have trouble installing the dependency rstan, see these instructions

• Installing from source requires that you have your toolchain setup properly. See the instructions for:

  • Linux
  • Windows
  • Mac

Using R < 4.2

If you are using R version 4.1 or earlier, you can get an error

cc1plus.exe: out of memory allocating 65536 bytes
make: *** [C:/PROGRA~1/R/R-40~1.2/etc/i386/Makeconf:227: stanExports_lgp_latent.o] Error 1

because both 64-bit and 32-bit versions of the package are getting installed. To disable this and resolve error, ugrade to latest R or install the version that has Biarch: false by

devtools::install_github('jtimonen/lgpr', ref = "no-biarch")

Real data and reproducing the experiments

For code to reproduce the experiments of our manuscript see https://github.com/jtimonen/lgpr-usage. Preprocessed longitudinal proteomics data is also provided there. See also the built-in read_proteomics_data() function.