SEp_from_CIp {metaHelper} | R Documentation |
Standard Error from Confidence Interval for Differences of Means
Description
Calculates the standard error from the confidence interval limits for differences of means (and can also be used for the confidence intervals of standardized mean differences, SMD).
This method is valid only when the confidence interval is symmetrical around the mean and is applicable for t-distributions or normal distributions (as specified by the t_dist
argument).
For sample sizes less than 60, it is generally recommended to use the t-distribution.
Usage
SEp_from_CIp(
CI_low,
CI_up,
n1 = NA,
n2 = NA,
sig_level = 0.05,
two_tailed = TRUE,
t_dist = TRUE
)
Arguments
CI_low |
lover OR confidence interval limit |
CI_up |
upper OR confidence interval limit |
n1 |
sample size group 1 (not required if t_dist = FALSE) |
n2 |
sample size group 2 (not required if t_dist = FALSE) |
sig_level |
the significance level |
two_tailed |
whether the two-tailed or one-tailed statistics should be calculated |
t_dist |
whether the t-distribution should be calculated - requires samples sizes |
Value
Pooled standard error (e.g. intervention effect)
References
Examples
# lower CI = -1.5, upper CI = 0.5
SEp_from_CIp(-1.5, 0.5)