• Aucun résultat trouvé

A power primer

N/A
N/A
Protected

Academic year: 2022

Partager "A power primer"

Copied!
1
0
0

Texte intégral

(1)

Tutorials in Quantitative Methods for Psychology  2007, Vol. 3 (2), p. 79. 

A power primer 

Jacob Cohen  New York University   

 

One possible reason for the continued neglect of statistical power  analysis in research in the behavioral sciences is the inaccessibility of or  difficulty  with  the standard material.  A  convenient,  although not  comprehensive, presentation of required sample sizes is provided. 

Effect‐size indexes and conventional values for these are given for  operationally defined small, medium, and large effects. The sample  sizes necessary for .80 power to detect effects at these levels are tabled  for 8 standard statistical tests: (1) the difference between independent  means, (2) the significance of a product‐moment correlation, (3) the  difference between independent rs, (4) the sign test, (5) the difference  between independent proportions, (6) chi‐square tests for goodness of  fit and contingency tables, (7) 1‐way analysis of variance (ANOVA),  and (8) the significance of a multiple or multiple partial correlation. 

                                 

From Psychological Bulletin (1992), vol 112(1), p. 155‐159 .  Copyright © 1992 by the American Psychological  Association.  Reproduced with permission.  For information on how to obtain the full text to this article,  please visit http://www.apa.org/psycarticles . 

   

  79 

Références

Documents relatifs

Grâce à leur savoir irrévocable, ils s’avancent tous de leur avis sans équivoque à promouvoir les valeurs innovantes de ce vin à la saveur envoutante et

Although the lexical string functions have some direct application outside of macros, lexical functions are primarily used in conjunction with the macro

That’s done on purpose to (hopefully) confuse you further. If you don’t know where one word starts and another begins, it makes it harder for a casual viewer to make any sense of

One may say that a protocol is concurrently secure if whatever the adversary may obtain by invoking and controlling parties in real concurrent executions of the protocol is

These calls allow a user process to detect events that occur at the Stream head on one or more Streams, including receipt of a data or protocol message on the read

The word “resonance” is then to be taken in the usual sense: the strong variation of ∆E within a small range of variation of one parameter (1/ ~ ) is directly related to the

4) a que vigilen y evalúen los progresos realizados hacia el logro de las metas nacionales de salud y desarrollo, y en particular el uso eficaz de las enfermeras y las parteras en

MAIN MESSAGE Bariatric surgery should be considered for obese patients at high risk of morbidity and mortality who have not achieved adequate weight loss with lifestyle and