CI_smd_one: Estimate standardized mean difference (Cohen's d1) for a...

In rcalinjageman/esci: Estimation Statistics with Confidence Intervals

Estimate standardized mean difference (Cohen's d1) for a single group

Description

CI_smd_one STILL NEEDS WORK TO VERIFY APPROACH FOR SE and MoE

Usage

CI_smd_one(mean, sd, n, reference_mean, conf_level = 0.95, correct_bias = TRUE)

Arguments

mean	Mean for a single group for the outcome measure
sd	Standard deviation, > 0
n	Sample size, an integer > 2
reference_mean	defaults to 0
conf_level	The confidence level for the confidence interval, in decimal form. Defaults to 0.95.
correct_bias	Defaults to TRUE

Value

Returns a list with these named elements:

• effect_size - the point estimate from the sample

• lower - lower bound of the CI

• upper - upper bound of the CI

• numerator - the numerator for Cohen's d_biased; the mean difference in the contrast

• denominator - the denominator for Cohen's d_biased; if equal variance is assumed this is sd_pooled, otherwise sd_avg

• df - the degrees of freedom used for correction and CI calculation

• se - the standard error of the estimate; warning not totally sure about this yet

• moe - margin of error; 1/2 length of the CI

• d_biased - Cohen's d without correction applied

• properties - a list of properties for the result

Properties

• effect_size_name - if equal variance assumed d_s, otherwise d_avg

• effect_size_name_html - html representation of d_name

• denominator_name - if equal variance assumed sd_pooled otherwise sd_avg

• denominator_name_html - html representation of denominator name

• bias_corrected - TRUE/FALSE if bias correction was applied

• message - a message explaining denominator and correction status

• message_html - html representation of message

Examples

# example code
res <- esci::CI_smd_one(24.5, 3.65, 40, 20)

rcalinjageman/esci documentation built on March 29, 2024, 7:30 p.m.