Issues in COVID-19 research and statistical analyses (Part XVVXVVVII)
March 15, 2023 In a recent article that appeared in Science News, a teach from Johns Hopkins University discussed their proof of concept study to show how their machine learning system used electronic health data to make predictions to determine who would be most...
Statistical issues in survival analysis (Part IV)
February 28, 2023 The author, Olivier Bouaziz, developed a new method to calculate pseudo-observations for the survival function and also the restricted mean survival time (RMST) that used formulas which were based on the original estimators and not on the...
Statistical issues in survival analysis (Part III)
February 15, 2023 In an article recently published in the Biometrical Journal, Magir and Jimenez discuss delayed separation of survival curves with proposals for a new weighted log-rank test to handle this through stratification. This common problem has occurred in...
Statistical issues from publications (publication bias adjustment with IPW)
February 1, 2023 In an article recently published in Biometics, Huang et al discuss how to adjust for publication bias in meta analyses via using inverse probability weighted adjusted measures of meta-analyses. The authors were motivated by the fact that...
Statistical issues in survival analyses (Part II)
January 16, 2023 In an article recently published online in The Biometrical Journal, Handorf et al seek to understand what is the best way to model survival data in the presence of non-proportional hazards, perhaps from the effect of confounding variables. The...
Statistical issues in survival analyses (Part I)
January 3, 2022 In an article originally published online August 13, 2021, but published recently in print, Vakulenko-Lagun et al discuss a technique to handle dependence between event times and left truncation. The left truncation generally happens due when there is...
Issues in COVID-19 research and statistical analyses (Part XVVXVVVI)
December 21, 2022 In an article published on December 14, 2022 in MSN.com, researchers had been studying the effect of COVID-19 and exercise and had found a strong correlation or link between the disease and exercise according to research cited from an article...
Issues in COVID-19 research and statistical analyses (Part XVVXVVV)
December 5, 2022 A recent article that appeared December 1 in JAMA Open Network shows the retrospective analysis of Remdesivir treatment for inpatient mortality among COVID-19 patients using insurance claims data amongst 24,856 adults hospitalized between May 1, 2020...
Issues in COVID-19 research and statistical analyses (Part XVVXVVIV)
Issues in COVID-19 research and statistical analyses (Part XVVXVVIV) November 23, 2022 In an article from November 11, 2022 in Health News from NPR, Rob Stein lays out the likelihood of two new Omicron subvariants, BQ.1 and BQ.11 of SARS-Cov-2 having become dominant...
Issues in COVID-19 research and statistical analyses (Part XVVXVVIII)
November 9, 2022 In a recent article from November 1 in Science Immunology, the authors reported on their analysis of T-cell immunity four weeks and six months after different vaccination regimens and four weeks after an additional booster vaccination. This was a...