Sample size calculation in epidemiological studies

Sample size calculation in epidemiological studies 227 where N is the size of the population and n is the size of the sample. If fpc is close to 1, then there is almost no ef-

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Estudio epidemiológico de casos y autocontroles: …

Martín-Rodríguez y cols. Gac Méd Méx Vol. 146 No. 1, 2010 37 (www.anmm.org.mx) Estudio epidemiológico de casos y autocontroles: una aproximación conceptual y …