ABSTRACT Effect-size measurement is a practice that is gradually encouraged indeed required by psychological and social behavior reviews in addition to the classical test of statistical significance. This paper is written as a methodo- logical note that presents the conceptual interest of the effect-size, the main measurement indicators and their interpretation.
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nullLourel, M. , Gueguen, N. , Pascual, A. & Mouda, F. (2011). The Effect-Size: A Simple Methodology for Determining and Evaluating the “Effect-Size”. Psychology, 2, 631-632. doi: 10.4236/psych.2011.26096.
 Berk, R. A., & Freedman, D. (2003). Statistical assumptions as empirical commitments. In T. G. Blomberg and S. Cohen (Eds.). Law, Punishment, and Social Control: Essays in Honor of Sheldon Messinger (2nd ed.) (pp. 235-254). New York, NY: Aldine.
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Erlbaum.
Guéguen, N., & Fischer-Lokou, J. (1999). Sequential request strategy: Effect of donor generosity. The Journal of Social Psychology, 139, 669-671.
Harris, M. B. (1972). The effects of performing one altruistic act on the likelihood of performing anaother. The Journal of Social Psychology, 88, 65-73. doi:10.1080/00224545.1972.9922544
Lipsey, M. W., & Wilson, D. B. (2000). Practical Metanalysis. Thousand Oaks, CA: Sage Publications.
Rosenthal, R., & Rosnow, R. L. (1991). Essentials of behavioral research: Methods and data analysis (2nd ed.). New York: McGraw Hill.
Thompson, B. (in press) Research synthesis: Effect sizes. In J. Green, G. Camilli, & P.B. Elmore (Ed.), Complementary methods for researchin education. Washington, DC: American Educational Research Association.