Compară metode

	Interval de încredere	Effect Size
Domeniu	Statistică pentru cercetare	Statistică pentru cercetare
Familie	Process / pipeline	Process / pipeline
Anul apariției	1937	1988
Autorul original	Jerzy Neyman	Jacob Cohen
Tip	Concept	Concept
Sursa seminală	Neyman, J. (1937). Outline of a Theory of Statistical Estimation Based on the Classical Theory of Probability. Philosophical Transactions of the Royal Society, 236, 333–380.	Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences (2nd ed.). Lawrence Erlbaum Associates. ISBN: 0-8058-0283-5
Denumiri alternative	CI, 95% CI, credible interval, interval estimate	ES, Cohen's d, standardized effect, practical significance
Înrudite	4	4
Rezumat	A confidence interval (CI) is a range of values, calculated from sample data, that likely contains the true population parameter. Introduced by Jerzy Neyman in 1937, it provides an interval estimate rather than a single point estimate, incorporating both the observed value and the uncertainty around it. The standard 95% confidence interval is a robust, intuitive alternative to p-values for communicating research results.	Effect size quantifies the magnitude of a research finding independent of sample size. While a p-value tells you whether a result is statistically significant, an effect size tells you how big the result is. Jacob Cohen formalized effect size measurement in behavioral sciences (1988), establishing standard benchmarks (small = 0.2, medium = 0.5, large = 0.8 for Cohen's d). Effect sizes are essential for meta-analysis, power analysis, and communicating the practical importance of research findings.