estRR {samplesizeestimator}

Sample size for estimation of Relative Risk

Description

Relative risks are estimated in a cohort study design to assess the association of exposure with the outcome. This function estimates the sample size needed to estimate the true relative risk with specified precision.

Usage

estRR(p0, RR, alp, prec, k)

Arguments

p0

Probability of outcome among unexposed

RR

anticipated Relative Risk (RR)

alp

level of significance or probability of claiming the association exists when in fact there is no association

prec

Precision desired on either side of RR

k

the number of unexposed for each exposed

Value

a list object, the required minimum sample size along with description for reporting

Author(s)

R. Amala, Scientist-C, ICMR-VCRC, Puducherry & G. Kumarapandiyan, Asst. Prof., Madras Christian College, Chennai

Examples

estRR(p0=0.2, RR=2, alp=0.05, prec=0.25, k=1)