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2006, Number S2

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Rev Med Inst Mex Seguro Soc 2006; 44 (S2)

Basic concepts and premises to calculate sample size

Guerra MA, Carrillo MMG
Full text How to cite this article

Language: Spanish
References: 5
Page: 67-70
PDF size: 71.59 Kb.


Key words:

statistics, sample size.

ABSTRACT

Sample size is a crucial aspect in a research project, since it allows the assessment of the real effect of an intervention or observation. Its calculation depends on a series of factors, such as the research question, study design, hypothesis, variables, rank of error, effect size and statistical significance. Each of them must be known and established by the researcher. Statistical packages in computer systems make the calculation of the sample size easier, but they invariably require the introduction of information, which the researcher can get from published studies, his own experience or pilot studies.


REFERENCES

  1. Reynaga Obregón J, Gómez Gómez M. Estadística básica en ciencias de la salud. Mex. DF; 2000.

  2. Mejía-Arangué J, Fajardo-Gutiérrez A, Gómez-Delgado A, Cuevas-Urióstegui M, Hernández- Hernández D, Garduño-Espinoza J y cols. El Tamaño de la muestra: un enfoque práctico en la investigación clínica pediátrica. Bol Med Hosp Infant Mex 1995;52(6):381-391.

  3. Browner W, Newman T, Cummings S, Hulley S. Preparación para estimar el tamaño de la muestra: hipótesis y principios subyacentes. En: Hulley B. Diseño de la investigación clínica. Segunda edición; 1997. p. 143-151.

  4. Gómez-Gómez M, Danglot-Banck C, Velásquez-Jones L. Bases para la revisión crítica de artículos médicos. Rev Mex Pediatr 2001;68(4):152-59.

  5. Fajardo Rodríguez A, González Ávila G. Cómo preparar un resumen estructurado. Nutr Clin 1998;1(1):28-39.




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C?MO CITAR (Vancouver)

Rev Med Inst Mex Seguro Soc. 2006;44