es_from_student_t {metaConvert}

Convert a Student's t-test value to several effect size measures

Description

Convert a Student's t-test value to several effect size measures

Usage

es_from_student_t(
  student_t,
  n_exp,
  n_nexp,
  smd_to_cor = "viechtbauer",
  reverse_student_t
)

Arguments

student_t

Student's t-test value.

n_exp

number of participants in the experimental/exposed group.

n_nexp

number of participants in the non-experimental/non-exposed group.

smd_to_cor

formula used to convert the student_t value into a coefficient correlation (see details).

reverse_student_t

a logical value indicating whether the direction of generated effect sizes should be flipped.

Details

This function converts the Student's t-test value into a Cohen's d (D) and Hedges' g (G), Odds ratio (OR) and correlation coefficients (R/Z) are then converted from the Cohen's d.

To estimate a Cohen's d the formula used is (table 12.1 in Cooper):

cohen\_d = student\_t * \sqrt{\frac{(n\_exp+n\_nexp)}{n\_exp*n\_nexp}}

To estimate other effect size measures, calculations of the es_from_cohen_d() are applied.

Value

This function estimates and converts between several effect size measures.

natural effect size measure	D + G
converted effect size measure	OR + R + Z
required input data	See 'Section 11. ANOVA statistics, Student's t-test, or point-bis correlation'
	https://metaconvert.org/html/input.html

References

Cooper, H., Hedges, L.V., & Valentine, J.C. (Eds.). (2019). The handbook of research synthesis and meta-analysis. Russell Sage Foundation.

Examples

es_from_student_t(student_t = 2.1, n_exp = 20, n_nexp = 22)