We used Hedges's g, a measure of effect size
, for each study in this meta-analysis because the samples in many of the studies were small and Hedges's g correction was used to reduce this small sample size bias.
The effect size
for the four studies (Davies et al.
Sapp helps people learn to calculate effect size
for their research design, explaining that an effect size
lets a clinician or researcher determine the effect of a treatment, and a confidence interval around an effect size
allows them to describe the effect size
within a given population.
The investigators found that the treatment effect size
varied by the target problem.
However, in neuroimaging, there is no standardised way to communicate effect sizes
, which makes the choice of an appropriate effect size
a formidable task.
First, a study needed to include objective psychological testing of adolescent personality and behavior from which an effect size
could be measured.
The study's preestablished cutoff for clinically important pain reduction was an effect size
Seven articles, involving 171 participants, looked at the effect of stimulants on sleep latency and had a combined effect size
In this issue, the Research Report entitled "Travel in Adverse Winter Weather Conditions by Blind Pedestrians: Effect of Cane Tip Design on Travel on Snow," by Kim, Wall Emerson (the author of this Statistical Sidebar), and Gaves makes note of something called an effect size
Authors William Shadish, Larry Hedges, Robert Horner, and Samuel Odom contend that the best way to ensure that SCD research is accessible and informs policy decisions is to use good standardized effect size
measures--indices that put results on a scale with the same meaning across studies--for statistical analyses.
At the core, MA uses three bits of information from each prior study: (1) effect size
, (2) confidence interval of the effect size
, and (3) sample size.
Furthermore, meta-analyses limited with only published studies may in fact balloon effect size
estimates [42-44]; (2) at least one parent in each study had to have an existing diagnosis of alcohol abuse, alcohol dependence, or some depressive disorder (i.