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Tidy a(n) rma object

Source: R/metafor-tidiers.R
metafor_tidiers.Rd

Tidy summarizes information about the components of a model. A model component might be a single term in a regression, a single hypothesis, a cluster, or a class. Exactly what tidy considers to be a model component varies across models but is usually self-evident. If a model has several distinct types of components, you will need to specify which components to return.

Usage

# S3 method for class 'rma'
tidy(
  x,
  conf.int = FALSE,
  conf.level = 0.95,
  exponentiate = FALSE,
  include_studies = FALSE,
  measure = "GEN",
  ...
)

Arguments

x

An rma object such as those created by metafor::rma(), metafor::rma.uni(), metafor::rma.glmm(), metafor::rma.mh(), metafor::rma.mv(), or metafor::rma.peto().

conf.int

Logical indicating whether or not to include a confidence interval in the tidied output. Defaults to FALSE.

conf.level

The confidence level to use for the confidence interval if conf.int = TRUE. Must be strictly greater than 0 and less than 1. Defaults to 0.95, which corresponds to a 95 percent confidence interval.

exponentiate

Logical indicating whether or not to exponentiate the the coefficient estimates. This is typical for logistic and multinomial regressions, but a bad idea if there is no log or logit link. Defaults to FALSE.

include_studies

Logical. Should individual studies be included in the output? Defaults to FALSE.

measure

Measure type. See metafor::escalc()

...

Additional arguments. Not used. Needed to match generic signature only. Cautionary note: Misspelled arguments will be absorbed in ..., where they will be ignored. If the misspelled argument has a default value, the default value will be used. For example, if you pass conf.lvel = 0.9, all computation will proceed using conf.level = 0.95. Two exceptions here are:

  • tidy() methods will warn when supplied an exponentiate argument if it will be ignored.

  • augment() methods will warn when supplied a newdata argument if it will be ignored.

Value

A tibble::tibble() with columns:

conf.high

Upper bound on the confidence interval for the estimate.

conf.low

Lower bound on the confidence interval for the estimate.

estimate

The estimated value of the regression term.

p.value

The two-sided p-value associated with the observed statistic.

statistic

The value of a T-statistic to use in a hypothesis that the regression term is non-zero.

std.error

The standard error of the regression term.

term

The name of the individual study

type

The estimate type (summary vs individual study)

Examples


# load libraries for models and data
library(metafor)

df <-
  escalc(
    measure = "RR",
    ai = tpos,
    bi = tneg,
    ci = cpos,
    di = cneg,
    data = dat.bcg
  )

meta_analysis <- rma(yi, vi, data = df, method = "EB")

tidy(meta_analysis)
#> # A tibble: 1 × 6
#>   term    type    estimate std.error statistic   p.value
#>   <chr>   <chr>      <dbl>     <dbl>     <dbl>     <dbl>
#> 1 overall summary   -0.715     0.181     -3.95 0.0000774