es_variab_from_means_se function

Convert means and/or standard errors of two independent groups into two effect measures (VR/CVR)

es_variab_from_means_se(
  mean_exp,
  mean_nexp,
  mean_se_exp,
  mean_se_nexp,
  n_exp,
  n_nexp,
  reverse_means_variability
)

Arguments

• mean_exp: mean of participants in the experimental/exposed group.
• mean_nexp: mean of participants in the non-experimental/non-exposed group.
• mean_se_exp: standard error of participants in the experimental/exposed group.
• mean_se_nexp: standard error of participants in the non-experimental/non-exposed group.
• n_exp: number of participants in the experimental/exposed group.
• n_nexp: number of participants in the non-experimental/non-exposed group.
• reverse_means_variability: a logical value indicating whether the direction of the generated effect sizes should be flipped.

Returns

This function estimates VR and CVR

natural effect size measure	VR + CVR
converted effect size measure	No conversion performed
required input data	See 'Section 23. User's input (crude)'
	https://metaconvert.org/html/input.html

Details

This function converts the standard errors into standard deviations.

$$mean\_sd\_exp = mean\_se\_exp * \sqrt{n\_exp - 1}$$ $$mean\_sd\_nexp = mean\_se\_nexp * \sqrt{n\_nexp - 1}$$

Then, calculations of the es_variab_from_means_sd are applied.

Examples

es_variab_from_means_se(
  mean_exp = 42, mean_se_exp = 11,
  mean_nexp = 42, mean_se_nexp = 15,
  n_exp = 43, n_nexp = 34
)

References

Senior, A. M., Viechtbauer, W., & Nakagawa, S. (2020). Revisiting and expanding the meta-analysis of variation: The log coefficient of variation ratio. Research Synthesis Methods, 11(4), 553-567. https://doi.org/10.1002/jrsm.1423