product_fraction

vector of factors of the numerator

vector of factors of the denominator

Reduces out factors of fraction of products and calculates the fraction
Analog to prod(num)/prod(den)

An R implementation of the Necessary and Probably Sufficient (NPS) test for finding valid instrumental variables, as suggested by Amit Sharma (2016, Working Paper) <http://amitsharma.in/pubs/necessary_probably_sufficient_iv_test.pdf>. The NPS test, compares the likelihood that a given set of observational data of the three variables Z, X and Y is generated by a valid instrumental variable model (Z -> X -> Y) to the likelihood that the data is generated by an invalid IV model.

Fabian Sellmann

npsr

product_fraction: Reduces out factors of fraction of products and calculates the fraction Analog to prod(num)/prod(den)

Description

Usage

Arguments