Tag Meta-analysis

Sin categoría, Statistics

The polysemy of Q

Cochran's Q is a widely used measure to detect heterogeneity between primary studies in a meta-analysis. Its statistical properties and hypothesis testing are reviewed. Finally, other measures calculated from this value are described, such as the I2 statistic and the H2 statistic, frequently used to quantify the intensity of heterogeneity between studies.

Manuel Molina
04/16/2024

Sin categoría, Statistics

The Palace of Probabilities

With small sample size, the variance of the Pearson’s coefficient increases, decreasing the precision of its estimates. The use of Fisher's z helps to stabilize the variance and obtain more precise estimates in meta-analyses whose outcome measure is a correlation, and when the sample of primary studies is small.

Manuel Molina
02/27/2024

Epidemiology, Sin categoría, Statistics

A weakness

Calculation of NNT in meta-analysis. The calculation of NNT (number needed to treat) in meta-analysis is described using RR and OR, which are more robust against variability in baseline risk.

Manuel Molina
04/21/2020

Critical appraisal, Statistics

Little ado about too much

Critical appraisal of meta-analysis. Guidelines for critical reading of a meta-analysis are proposed. The main points dealt with by the PRISMA declaration are also described.

Manuel Molina
10/30/2018

Sin categoría, Statistics

Achilles and Effects Forest

Publication bias. We describe publication bias in meta-analysis and the most used methods that are empoyed for its study, both graphical and numerical.

Manuel Molina
06/26/2018