dat.curtin2002 | R Documentation |
Results from 21 cross-over studies evaluating the effect of potassium supplementation to reduce diastolic blood pressure.
dat.curtin2002
The data frame contains the following columns:
author | character | first author |
year | character | year of publication |
N | integer | total sample size |
mean | numeric | mean difference in diastolic blood pressure |
SE | numeric | standard error |
corr | numeric | within-patient correlation |
Results from 21 cross-over studies evaluating the effect of potassium supplementation to reduce diastolic blood pressure (Curtin et al., 2002, Table II).
This data set is used as an example in Schwarzer et al. (2015), Chapter 2.
raw mean differences
Guido Schwarzer, guido.schwarzer@uniklinik-freiburg.de, https://github.com/guido-s/
Curtin, F., Altman, D. G., & Elbourne, D. (2002). Meta-analysis combining parallel and cross-over clinical trials. I: Continuous outcomes. Statistics in Medicine, 21(15), 2131–2144. https://doi.org/10.1002/sim.1205
Schwarzer, G., Carpenter, J. R., & Rücker, G. (2015). Meta-analysis with R. Cham, Switzerland: Springer.
### Show first five studies
head(dat.curtin2002, 5)
## Not run:
### Load meta package
suppressPackageStartupMessages(library("meta"))
### Use DerSimonian-Laird estimator (which was the default in meta in the year 2015).
### Furthermore, print meta-analysis results with two digits.
oldset <- settings.meta(method.tau = "DL", digits = 2)
### Conduct meta-analysis
mg2 <- metagen(mean, SE, studlab = paste(author, year),
data = dat.curtin2002, sm = "MD")
mg2
### Use previous settings
settings.meta(oldset)
## End(Not run)
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