Upload, download, and edit internet maps with the Felt API 
    (<https://feltmaps.notion.site/Felt-Public-API-reference-c01e0e6b0d954a678c608131b894e8e1>). 
    Allows users to create new maps, edit existing maps, and extract data.
    Provides tools for working with layers, which represent geographic data, and elements,
    which are interactive annotations. Spatial data accessed from the API is 
    transformed to work with 'sf'.

Efficient estimation of maximum likelihood models with multiple fixed-effects. Standard-errors can easily and flexibly be clustered and estimations exported.

A structured profile likelihood algorithm for the logistic fixed effects model and an approximate expectation maximization (EM) algorithm for the logistic mixed effects model. Based on He, K., Kalbfleisch, J.D., Li, Y. and Li, Y. (2013) <doi:10.1007/s10985-013-9264-6>.

R implementations of standard financial engineering codes;
  vanilla option pricing models such as Black-Scholes, Bachelier, CEV, and
  SABR.

Data from various catalogs of astrophysical gamma-ray sources
    detected by NASA's Large Area Telescope (The Astrophysical Journal, 697, 1071,
    2009 June 1), on board the Fermi gamma-ray satellite. More information on
    Fermi and its data products is available from the Fermi Science Support Center
    (http://fermi.gsfc.nasa.gov/ssc/).

Diagnostic plots for optimisation, with a focus on projection pursuit. These show paths the optimiser 
    takes in the high-dimensional space in multiple ways: by reducing the dimension using principal component analysis, and
    also using the tour to show the path on the high-dimensional space. Several botanical colour palettes are included, reflecting the 
    name of the package. A paper describing the methodology can be found at <https://journal.r-project.org/archive/2021/RJ-2021-105/index.html>.

Quantify variability (such as confidence interval) of fertilizer response curves and optimum fertilizer rates using bootstrapping residuals with several popular non-linear and linear models.