Analysis code and Latex source of the manuscript describing the conditional permutation test of confounding bias in predictive modelling.

Related tags

Deep Learningmachine-learningstatistical-testspermutation-testconditional-independenceconfounder
Overview

arXiv lintex

Git repositoty of the manuscript entitled

Statistical quantification of confounding bias in predictive modelling

by Tamas Spisak

The manuscript describes and validates the package mlconfound.

Read the docs. Documentation Status.

Abstract

The lack of non-parametric statistical tests for confounding bias significantly hampers the development of robust, valid and generalizable predictive models in many fields of research. Here I propose the partial and full confounder tests, which, for a given confounder variable, probe the null hypotheses of unconfounded and fully confounded models, respectively.

The tests provide a strict control for Type I errors and high statistical power, even for non-normally and non-linearly dependent predictions, often seen in machine learning. Applying the proposed tests on models trained on functional brain connectivity data from the Human Connectome Project and the Autism Brain Imaging Data Exchange dataset reveals confounders that were previously unreported or found to be hard to correct for with state-of-the-art confound mitigation approaches.

The tests (implemented in the package mlconfound can aid the assessment and improvement of the generalizability and neurobiological validity of predictive models and, thereby, foster the development of clinically useful machine learning biomarkers.

This repository contains:

  • The latex source of the manuscript describing the 'mlconfound' approach: see manuscript.tex and related files.
  • Sll source code required to reproduce the results in the manuscript. See the directories: simulated and empirical.
  • All results. See the directories simulated/results and the analysis notebooks.
  • All figures. See the directory fig.

To reproduce the whole analysis:

./reproduce.sh

Citation

T. Spisak, Statistical quantification of confounding bias in predictive modelling, preprint on arXiv:2111.00814, 2021.

Licensing

  • Manuscript source and figures (contents of the root folder and the fig dir): CC BY
  • Source code (contents of the empirical and simulated folders): GPL3

Acknowledgements

The manuscript builds on an aesthetic and simple LaTeX style suitable for "preprint" publications such as arXiv and bio-arXiv, etc. It is based on the nips_2018.sty style.

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