Be responsible when scraping data from websites by following polite principles: introduce yourself, ask for permission, take slowly and never ask twice.

Detecting markers of politeness in English natural language. This package allows researchers to easily visualize and quantify politeness between groups of documents. This package combines prior research on the linguistic markers of politeness. We thank the Spencer Foundation, the Hewlett Foundation, and Harvard's Institute for Quantitative Social Science for support.

A toolbox to facilitate the calculation of political system indicators for researchers. 
    This package offers a variety of basic indicators related to electoral systems, party systems, elections,
    and parliamentary studies, as well as others. Main references are:
    Loosemore and Hanby (1971) <doi:10.1017/S000712340000925X>;
    Gallagher (1991) <doi:10.1016/0261-3794(91)90004-C>;
    Laakso and Taagepera (1979) <doi:10.1177/001041407901200101>;
    Rae (1968) <doi:10.1177/001041406800100305>;
    Hirschmaņ (1945) <ISBN:0-520-04082-1>;
    Kesselman (1966) <doi:10.2307/1953769>;
    Jones and Mainwaring (2003) <doi:10.1177/13540688030092002>;
    Rice (1925) <doi:10.2307/2142407>;
    Pedersen (1979) <doi:10.1111/j.1475-6765.1979.tb01267.x>;
    SANTOS (2002) <ISBN:85-225-0395-8>.

Package for learning and evaluating (subgroup) policies via doubly robust loss functions. Policy learning methods include doubly robust blip/conditional average treatment effect learning and sequential policy tree learning. Methods for (subgroup) policy evaluation include doubly robust cross-fitting and online estimation/sequential validation. See Nordland and Holst (2026) <doi:10.18637/jss.v116.i04> for documentation and references.

Supports analysis of aerobiological data. 
    Available features include determination of pollen season limits, 
    replacement of outliers (Kasprzyk and Walanus (2014) <doi:10.1007/s10453-014-9332-8>),
    calculation of growing degree days (Baskerville and Emin (1969) <doi:10.2307/1933912>), 
    and determination of the base temperature for growing degree days
    (Yang et al. (1995) <doi:10.1016/0168-1923(94)02185-M).