Open Access DOI:10.23937/2469-5831/1510027
Application of Hierarchical Polynomial Regression Models to Predict Transmission of COVID-19 at Global Level
Matthew Ekum and Adeyinka Ogunsanya
Article Type: Research Article | First Published: June 27, 2020
COVID-19 is the disease caused by a novel coranavirus, which outbreak started in Wuhan community of China during December, 2019. World Health Organisation (WHO) started reporting cases of COVID-19 on 21st January. In this research, we aimed at forecasting new cases of COVID-19 per day, using data collected from 21st January to 10th June, 2020, spanning 142 days, by fitting polynomial models. Different model selection criteria were used to determine the most appropriate model among assumed models...
Open Access DOI:10.23937/2469-5831/1510026
The Basic Four Measures and their Derivates in Dichotomous Diagnostic Tests
Tadeusz R Ostrowski, MD and Tadeusz Ostrowski, PhD
Article Type: Original Article | First Published: June 05, 2020
The paper focuses on four basic statistics of dichotomous diagnostic tests, i.e. sensitivity, specificity, positive and negative predictive value, and some of their derivates, like Youden index and predictive summary index, and on further derivates of these derivates, i.e. Matthews correlation coefficient (or Yule phi), chi squared test and Cramer’s V coefficient. The paper contains also the necessary and sufficient conditions for a test to be invalid, to be uninformative and the necessary con...
Open Access DOI:10.23937/2469-5831/1510025
Factors Influencing Resident Research: Evidence from a 10-Year Cohort
Adnan N Kiani, Babatunde Olaiya, Richard Berg and Ateeq Rehman
Article Type: Research Article | First Published: March 19, 2020
ACGME has put great emphasis on scholarly activity during residency, yet ACGME has not been able to identify gaps in achieving these goals. We possess longitudinal data for the last 10 years across our residency training programs. With this, we have identified missing gaps as well as propose interventions to address gaps. The research design employs utilizing a standardized research instrument (questionnaire), answered by every resident at the onset and completion of residency training. This que...
Open Access DOI:10.23937/2469-5831/1510024
Nonparametric Method for Estimation of Controlled Correlations in Studies of VEGF-Hypoxia Relationship
Maxim S Kodryan, Anna V Kuznetsova, Luidmila L Klimenko, Aksana N Mazilina, Ivan V Baskakov and Oleg V Senko
Article Type: Research Article | First Published: March 04, 2020
It is known that vascular endothelial growth factor (VEGF) expression is a response to hypoxia. On the other hand hypoxia may be detected by oximetry parameters including venous CO-oximetry indices or corresponding partial pressures of O2 and CO2. However significant correlation ties between VEGF levels and oximetry parameters were not found in groups of patients with ischemic stroke and transient ischemic attack. At that some effect related to the relationship between VEGF and sO2 was observed ...