Extremely fast and memory efficient computation of the DER (or PaF) income polarization index as proposed by Duclos J. Y., Esteban, J. and Ray D. (2004). "Polarization: concepts, measurement, estimation". Econometrica, 72(6): 1737--1772. <doi:10.1111/j.1468-0262.2004.00552.x>. The index may be computed for a single or for a range of values of the alpha-parameter and bootstrapping is also available.

Modeling the zero coupon yield curve using the dynamic De Rezende and
             Ferreira (2011) <doi:10.1002/for.1256> five factor model with variable
             or fixed decaying parameters. For explanatory purposes, the package also
             includes various short datasets of interest rates for the BRICS countries.

R-based solution for symbolic differentiation. It admits
    user-defined function as well as function substitution
    in arguments of functions to be differentiated. Some symbolic
    simplification is part of the work.

Detects concept drift and data drift in streams produced by
    deployed machine learning models, using a tidy interface that composes
    with the 'tidymodels' ecosystem. Detectors are specified, fitted on a
    baseline period, and advanced over new batches of observations,
    returning tibbles annotated with warning and drift flags. A catalogue
    of 22 sequential drift detectors is provided. Error-based methods
    include the Drift Detection Method (DDM) of Gama et al. (2004)
    <doi:10.1007/978-3-540-28645-5_29>, the Early Drift Detection Method
    (EDDM) of Baena-Garcia et al. (2006), the Hoeffding's inequality
    based Drift Detection Methods (HDDM) of Frias-Blanco et al. (2015)
    <doi:10.1109/TKDE.2014.2345382>, and the Exponentially Weighted
    Moving Average (EWMA) chart of Ross et al. (2012)
    <doi:10.1016/j.patrec.2011.08.019>. Distribution-based methods
    include Adaptive Windowing (ADWIN) of Bifet and Gavalda (2007)
    <doi:10.1137/1.9781611972771.42>, Kolmogorov-Smirnov Windowing
    (KSWIN) of Raab et al. (2020) <doi:10.1016/j.neucom.2019.11.111>,
    and the Page-Hinkley test of Page (1954)
    <doi:10.1093/biomet/41.1-2.100>.