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

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## 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 sc@imbi.uni-freiburg.de

See Also

metabin, metacont, metagen, forest.meta

Examples

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data(Fleiss93cont)
#
# Generate additional variable with grouping information
#
Fleiss93cont$group <- c(1,2,1,1,2)
#
# Do meta-analysis without grouping information
#
meta1 <- metacont(n.e, mean.e, sd.e, n.c, mean.c, sd.c, study,
                  data=Fleiss93cont, sm="SMD")
#
# Update meta-analysis object and do subgroup analyses
#
summary(update(meta1, byvar=group))

#
# Same result using metacont function directly
#
meta2 <- metacont(n.e, mean.e, sd.e, n.c, mean.c, sd.c, study,
                  data=Fleiss93cont, sm="SMD", byvar=group)
summary(meta2)

#
# Compare printout of the following two commands
#
as.data.frame(meta1)
meta1$data

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