R/meta_rep.R
replicate.stdmean2.Rd
This function computes confidence intervals from an original study and a follow-up study where the effect size is a 2-group standardized mean difference. Confidence intervals for the difference and average effect size are also computed. Equality of variances within or across studies is not assumed. The confidence level for the difference is 1 – 2*alpha, which is recommended for equivalence testing. Square root unweighted variances, square root weighted variances, and single-group standard deviation are options for the standardizer.
replicate.stdmean2(
alpha,
m11,
m12,
sd11,
sd12,
n11,
n12,
m21,
m22,
sd21,
sd22,
n21,
n22,
stdzr
)
alpha level for 1-alpha confidence
estimated mean for group 1 in original study
estimated mean for group 2 in original study
estimated SD for group 1 in original study
estimated SD for group 2 in original study
sample size for group 1 in original study
sample size for group 2 in original study
estimated mean for group 1 in follow-up study
estimated mean for group 2 in follow-up study
estimated SD for group 1 in follow-up study
estimated SD for group 2 in follow-up study
sample size for group 1 in follow-up study
sample size for group 2 in follow-up study
set to 0 for square root unweighted average variance standardizer
set to 1 for group 1 SD standardizer
set to 2 for group 2 SD standardizer
set to 3 for square root weighted average variance standardizer
A 4-row matrix. The rows are:
Row 1 summarizes the original study
Row 2 summarizes the follow-up study
Row 3 estimates the difference in standardized mean differences
Row 4 estimates the average standardized mean difference
The columns are:
Estimate - standardized mean difference estimate (single study, difference, average)
SE - standard error
LL - lower limit of the confidence interval
UL - upper limit of the confidence interval
Bonett DG (2021). “Design and analysis of replication studies.” Organizational Research Methods, 24(3), 513--529. ISSN 1094-4281, doi:10.1177/1094428120911088 .
replicate.stdmean2(.05, 21.9, 16.1, 3.82, 3.21, 40, 40,
25.2, 19.1, 3.98, 3.79, 75, 75, 0)
#> Estimate SE LL UL
#> Original: 1.62803662 0.2629049 1.1286100 2.1591783
#> Follow-up: 1.56170447 0.1880713 1.2010594 1.9382853
#> Original - Follow-up: 0.07422178 0.3232488 -0.4574752 0.6059188
#> Average: 1.59487055 0.1616244 1.2780925 1.9116486
# Should return:
# Estimate SE LL UL
# Original: 1.62803662 0.2594668 1.1353486 2.1524396
# Follow-up: 1.56170447 0.1870576 1.2030461 1.9362986
# Original - Follow-up: 0.07422178 0.3198649 -0.4519092 0.6003527
# Average: 1.59487055 0.1599325 1.2814087 1.9083324