psychmeta (version 2.6.4)

limits_tau2: Confidence limits of tau-squared

Description

Note that this interval does not incorporate uncertainty in artifact estimates, so the interval will be somewhat conservative when applied to individual-correction or artifact-distribution meta-analyses.

Usage

limits_tau2(
  var_es,
  var_pre,
  k,
  method = c("profile_var_es", "profile_Q", "normal_logQ"),
  conf_level = 0.95,
  var_unbiased = TRUE
)

Value

The confidence limits of tau-squared

Arguments

var_es

The observed variance of effect sizes.

var_pre

The predicted variance of effect sizes due to artifacts.

k

The number of studies in a meta-analysis.

method

Which method to use to estimate the limits. Options are profile_var_es for a profile-likelihood interval assuming ^2_es ~ ^2(k-1)var_es ~ chi-squared (k - 1), profile_Q for a profile-likelihood interval assuming Q ~ ^2(k-1, )Q ~ chi-squared (k - 1, lambda), = _i=1kw_i( - )^2lambda = true_Q = sum(wi * (true_es - mean_true_es)^2), and normal_logQ for a delta method assuming log(Q) follows a standard normal distribution.

conf_level

Confidence level.

var_unbiased

Are variances computed using the unbiased (TRUE) or maximum likelihood (FALSE) estimator?

Examples

limits_tau2(var_es = 0.008372902, var_pre = 0.004778935, k = 20)