Riley et al. (2011) analyzed a hypothetical meta-analysis. They generated a data set of 10 studies examining the same antihypertensive drug. Negative estimates suggested reduced blood pressure in the treatment group.
data(sbp)A data frame with 10 rows and 2 variables
y: Standardized mean difference
sigmak: Standard error
label: Labels for each generated study
Riley, R. D., Higgins, J. P. T, and Deeks, J. J. (2011). Interpretation of random effects meta-analyses. BMJ. 342: d549. https://doi.org/10.1136/bmj.d549