as.data.frame.meta {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 class 'meta'
as.data.frame(x, row.names = NULL, optional = FALSE, ...)

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

Value

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

Author(s)

Guido Schwarzer [e-mail]

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