SMD_from_mean_matched {metaHelper} | R Documentation |
Calculates SMD from Matched Groups
Description
Calculates the standardized mean differences for matched groups. Needs either the mean of the groups or the difference between groups.
SD_within is usually not reported but can be calculated by the use of SD_within_from_SD_r()
.
Usage
SMD_from_mean_matched(M_diff = NA, M1 = NA, M2 = NA, SD_within)
Arguments
M_diff |
mean difference between groups |
M1 |
mean group 1 (in case M_diff not provided) |
M2 |
mean group 2 (in case M_diff not provided) |
SD_within |
within standard deviation. CAVE this is usually not reported but needs to be computed from the difference standard deviation.
This can be done with |
Value
Standardized Mean Differences
References
M., Hedges, L.V., Higgins, J.P.T. and Rothstein, H.R. (2009). Converting Among Effect Sizes. In Introduction to Meta-Analysis (eds M. Borenstein, L.V. Hedges, J.P.T. Higgins and H.R. Rothstein). https://doi.org/10.1002/9780470743386.ch7
Examples
# Calcuation with group means
SMD_from_mean_matched(M1 = 103, M2 = 100, SD_within = 7.1005)
# Calculation with group difference
SMD_from_mean_matched(M_diff = 3, SD_within = 7.1005)
# Calculation with standard deviation between
# Correlation Coefficient between groups
r <- 0.7
# SD between groups
SD_between <- 5.5
SMD_from_mean_matched(M_diff = 3,
SD_within = SD_within_from_SD_r(SD_between, r))