This repository contains the code to reproduce the findings in our paper "Possibilistic Instrumental Variable Regression with Potentially Invalid Instruments" (arxiv:2511.16029). The code for the simulation experiments can be found in simulations/simulation.jl and simulations/multiple_instruments_simulation.jl for the single and mutliple instrument scenarios, respectively. applications/AJR_Example.jl and applications/schooling_example.jl include all the code to reproduce the real-data applications.