New tests for null hypothesis of non unity ratio of proportions.

J Biopharm Stat

United States Food and Drug Administration, Silver Spring, MD 20993, USA.

Published: June 2007

Testing for noninferiority and equivalence between an experimental therapy and a standard therapy in terms of the ratio of binomial proportions is considered. New tests based on the Fieller-Hinkley distribution of the ratio of random variables are proposed. Restricted maximum likelihood estimates of the null variances are used to derive the tests. Sample size determination is discussed. The proposed test procedure is extended to multiple tables. The tests are applied to numerical examples.

Download full-text PDF

Source
http://dx.doi.org/10.1080/10543400601177426DOI Listing

Publication Analysis

Top Keywords

tests
4
tests null
4
null hypothesis
4
hypothesis unity
4
unity ratio
4
ratio proportions
4
proportions testing
4
testing noninferiority
4
noninferiority equivalence
4
equivalence experimental
4

Similar Publications

Liver cancer poses a global health challenge with limited therapeutic options. Notably, the limited success of current therapies in patients with primary liver cancers (PLCs) may be attributed to the high heterogeneity of both hepatocellular carcinoma (HCCs) and intrahepatic cholangiocarcinoma (iCCAs). This heterogeneity evolves over time as tumor-initiating stem cells, or cancer stem cells (CSCs), undergo (epi)genetic alterations or encounter microenvironmental changes within the tumor microenvironment.

View Article and Find Full Text PDF

Background: Alcohol use disorder and alcohol-associated liver disease is increasing in the US, with subsequent and expected increases in morbidity and mortality due to these conditions.

Aims: To determine the impact of an educational intervention regarding alcohol use disorder on gastroenterology fellows.

Methods: A before-after survey study was carried out.

View Article and Find Full Text PDF

Low Utility of Routine Thyroid Function Testing for Bowel Symptoms: A Population-Based Assessment.

Dig Dis Sci

January 2025

Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.

Background: Chronic constipation, diarrhea, and fecal incontinence (FI) are prevalent with significant impact on quality of life and healthcare utilization. Thyroid dysfunction was recognized as a potential contributor to bowel disturbances in selected populations, but the strength/consistency of this association remain unclear.

Aims: To investigate the relationship between thyroid function and bowel health measures (constipation, diarrhea, and FI) in a nationally representative sample of the U.

View Article and Find Full Text PDF

A prediction model for electrical strength of gaseous medium based on molecular reactivity descriptors and machine learning method.

J Mol Model

January 2025

Hubei Key Laboratory·for High-Efficiency-Utilization of Solar Energy and Operation, Control of Energy-Storage System, Hubei-University of Technology, Wuhan, 430068, China.

Context: Ionization and adsorption in gas discharge are similar to electrophilic and nucleophilic reactions. The molecular descriptors characterizing reactions such as electrostatic potential descriptors are useful in predicting the electrical strength of environmentally friendly gases. In this study, descriptors of 73 molecules are employed for correlation analysis with electrical strength.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!