meta (version 6.5-0)

as.data.frame.meta: Additional functions for objects of class meta

Description

The as.data.frame method returns a data frame containing information on individual studies, e.g., estimated treatment effect and its standard error.

Usage

# S3 method for meta
as.data.frame(x, row.names = NULL, optional = FALSE, ...)

Value

A data frame is returned by the function as.data.frame.

Arguments

x

An object of class meta.

row.names

NULL or a character vector giving the row names for the data frame.

optional

logical. If TRUE, setting row names and converting column names (to syntactic names) is optional.

...

other arguments

Author

Guido Schwarzer

See Also

metabin, metacont, metagen, forest.meta

Examples

data(Fleiss1993cont)
#
# Generate additional variable with grouping information
#
Fleiss1993cont$group <- c(1, 2, 1, 1, 2)
#
# Do meta-analysis without grouping information
#
m1 <- metacont(n.psyc, mean.psyc, sd.psyc, n.cont, mean.cont, sd.cont,
  data = Fleiss1993cont, sm = "SMD", studlab = paste(study, year))
#
# Update meta-analysis object and do subgroup analyses
#
update(m1, subgroup = group)

# Same result using metacont function directly
#
m2 <- metacont(n.psyc, mean.psyc, sd.psyc, n.cont, mean.cont, sd.cont,
  data = Fleiss1993cont, sm = "SMD", studlab = paste(study, year),
  subgroup = group)
m2

# Compare printout of the following two commands
#
as.data.frame(m1)
m1$data