Archive:: Science Journal of Applied Mathematics and Statistics:: Science Publishing Group

Volume 13, Issue 2, April 2025

Research Article
A Robust Quantile Regression Model for Count Data: The Half Cauchy Transformation Approach

Runyi Emmanuel Francis^*, Maureen Tobe Nwakuya, Maxwell Azubuike Ijomah

Issue: Volume 13, Issue 2, April 2025

Pages: 27-33

Received: 27 March 2025

Accepted: 7 April 2025

Published: 29 April 2025

DOI: 10.11648/j.sjams.20251302.11

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Abstract: This paper introduces an innovative approach to modelling count data through the introduction of a robust quantile regression model, the Half Cauchy Quantile Regression (HCQR). Count data is frequently challenged by outliers and skewed distributions. By integrating the heavy-tailed properties of the Half Cauchy distribution into the quantile regres... Show More

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Research Article
Analyzing Within-Group Changes in an Experiment: To Deal with Retest Effects, You Have to Go Latent But Not All Latents Are Equal

John Protzko, Jan te Nijenhuis, Khaled Elsayed Ziada, Hanaa Abdelazim Mohamed Metwaly, Salaheldin Farah Bakhiet^*, Yousif Balil Bashir Maki

Issue: Volume 13, Issue 2, April 2025

Pages: 34-44

Received: 27 February 2025

Accepted: 10 March 2025

Published: 14 May 2025

DOI: 10.11648/j.sjams.20251302.12

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Abstract: Analyzing within-group change in an experimental context, where the same group of people is measured before and after some event, can be fraught with statistical problems and issues with causal inference. Still, these designs are common from political science to developmental neuropsychology to economics. In cases with cognitive data, it has long b... Show More

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