A System of Plotting Optimized for Speed and Modularity (quickPlot)
A high-level plotting system, built using ‘grid’ graphics, that is optimized for speed and modularity. This has great utility for quick visualizations when testing code, with the key benefit that visualizations are updated independently of one another.

Methods in Mahalanobis-Taguchi (MT) System (MTSYS)
Mahalanobis-Taguchi (MT) system is a collection of multivariate analysis methods developed for the field of quality engineering. MT system consists of two families depending on their purpose. One is a family of Mahalanobis-Taguchi (MT) methods (in the broad sense) for diagnosis (see Woodall, W. H., Koudelik, R., Tsui, K. L., Kim, S. B., Stoumbos, Z. G., and Carvounis, C. P. (2003) <doi:10.1198/004017002188618626>) and the other is a family of Taguchi (T) methods for forecasting (see Kawada, H., and Nagata, Y. (2015) <doi:10.17929/tqs.1.12>). The MT package contains three basic methods for the family of MT methods and one basic method for the family of T methods. The MT method (in the narrow sense), the Mahalanobis-Taguchi Adjoint (MTA) methods, and the Recognition-Taguchi (RT) method are for the MT method and the two-sided Taguchi (T1) method is for the family of T methods. In addition, the Ta and Tb methods, which are the improved versions of the T1 method, are included.

A Very Fast 2D Concave Hull Algorithm (concaveman)
The concaveman function ports the ‘concaveman’ (<https://…/concaveman> ) library from ‘mapbox’. It computes the concave polygon(s) for one or several set of points.

Known Population Median Test (kpmt)
Functions that implement the known population median test.

Function-Based Numerical and Symbolic Differentiation and Antidifferentiation (mosaicCalc)
Part of the Project MOSAIC (<http://…/> ) suite that provides utility functions for doing calculus (differentiation and integration) in R. The main differentiation and antidifferentiation operators are described using formulas and return functions rather than numerical values. Numerical values can be obtained by evaluating these functions.