Archive:: American Journal of Applied Mathematics:: Science Publishing Group

Volume 10, Issue 5, October 2022

Accounting for Propensity Score Variability in IPTW Weighted Cox Proportional Hazards Regression and Risk Estimation

Michael Richard Crager

Issue: Volume 10, Issue 5, October 2022

Pages: 176-204

Received: 6 September 2022

Accepted: 4 October 2022

Published: 17 October 2022

DOI: 10.11648/j.ajam.20221005.11

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Abstract: Under the assumption of no unmeasured confounders, Cox proportional hazards regression with inverse probability of treatment (IPTW) weighting based on propensity scores can be used to produce approximately unbiased estimates of treatment effect hazard ratios and event risks using observational cohorts. Often the weights are treated as fixed even th... Show More

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On the Caginalp for a Conserved Phase-Field with Two Temperatures

Narcisse Batangouna, Cyr Séraphin Ngamouyih Moussata, Urbain Cyriaque Mavoungou

Issue: Volume 10, Issue 5, October 2022

Pages: 205-211

Received: 15 December 2021

Accepted: 7 March 2022

Published: 24 October 2022

DOI: 10.11648/j.ajam.20221005.12

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Abstract: The general theme of this article is the theorical study of phase field systems, more precisely that of Caginalp. This work is motivated by their immense applications in many physical fields, industriels… The Caginalp problem gives the authors a formulation based on the fact that the phases separated by an unknown regular interface, which evolves i... Show More

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Heat and Mass Transfer Effects on Unsteady Magnetohydrodynamics Stokes Free-Convective Flow Past an Infinite Vertical Porous Plate in a Rotating System

Mayaka Augustine Ayanga, Mathew Ngugi Kinyanjui, Jeconia Okelo Abonyo, Johana Kibet Sigey

Issue: Volume 10, Issue 5, October 2022

Pages: 212-222

Received: 30 August 2022

Accepted: 12 October 2022

Published: 24 October 2022

DOI: 10.11648/j.ajam.20221005.13

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Abstract: In this paper, Stokes first problem for an unsteady MHD free convective flow of a viscous incompressible fluid past an infinite vertical porous plate in the presence of a transverse variable magnetic field in a rotating system has been studied. The dimensionless governing partial differential equations are solved numerically by the finite differenc... Show More

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