This tool was designed to assess the sensitivity of research findings to omitted variables when estimating causal effects using propensity score (PS) weighting. This tool produces graphics and summary results that will enable a researcher to quantify the impact an omitted variable would have on their results. Burgette et al. (2021) describe the methodology behind the primary function in this package, ov_sim. The method is demonstrated in Griffin et al. (2020) <doi:10.1016/j.jsat.2020.108075>.

Open the current working directory (or a given directory path) in your computer's file manager.

Tools for collecting municipal-level data <http://www.transparencia.gov.br/swagger-ui.html> from several Brazilian governmental social programs.

An implementation of optimal weight exchange algorithm Yang(2013) <doi:10.1080/01621459.2013.806268> for three models.
    They are Crossover model with subject dropout, crossover model with proportional
    first order residual effects and interference model. You can use it to find either
    A-opt or D-opt approximate designs. Exact designs can be automatically rounded
    from approximate designs and relative efficiency is provided as well.

Evaluates the Owen Q-function for an integer value of the
    degrees of freedom, by applying Owen's algorithm (1965)
    <doi:10.1093/biomet/52.3-4.437>.  It is useful for the calculation of
    the power of equivalence tests.

Retrieve data from the Our World in Data (OWID) Chart API
    <https://docs.owid.io/projects/etl/api/>. OWID provides public access to 
    more than 5,000 charts focusing on global problems such as poverty, 
    disease, hunger, climate change, war, existential risks, and inequality.

Import data from 'Our World in Data', an organisation which publishes research and data on global economic and social issues.

Provides an Interface to Web-Services defined as standards by the Open Geospatial Consortium (OGC), including Web Feature Service
 (WFS) for vector data, Web Coverage Service (WCS), Catalogue Service (CSW) for ISO/OGC metadata, Web Processing Service (WPS) for data processes,
 and associated standards such as the common web-service specification (OWS) and OGC Filter Encoding. Partial support is provided for the Web Map 
 Service (WMS). The purpose is to add support for additional OGC service standards such as Web Coverage Processing Service (WCPS), the Sensor 
 Observation Service (SOS), or even new standard services emerging such OGC API or SensorThings.