### Sample size: from formulae to concepts - II

#### Abstract

Sample size formulae need some input data or to say it otherwise we need some parameters to calculate sample size. This second part on the formula explanation gives ideas of Z, population size, precision of error, standard deviation, contingency etc which influence sample size.

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PDF#### References

Pathak RR. Sample size: from formulae to concepts. Int J Basic Clin Pharmacol 2012;1:223-4.

Sample Size, Precision, and Power. Available at http://www.sjsu.edu/faculty/gerstman/StatPrimer/sampsize.PDF. Accessed 9 December 2012.

Israel GD. Determining Sample Size. Available at http://edis.ifas.ufl.edu/pd006. Accessed 7 December 2012.

Yamane T. Statistics: An Introductory Analysis, 2nd Ed. New York: Harper and Row; 1967.

Calculating the Sample Size. Available at http://www.ifad.org/gender/tools/hfs/anthropometry/ant_3.htm. Accessed 15 December 2012.

Introduction to sample size and power calculations. Available at http://www.stanford.edu/~kcobb/hrp259/lecture11.ppt. Accessed 15 December 2012.

Zhong B. How to Calculate Sample Size in Randomized Controlled Trial? J Thorac Dis 2009;1:51-4.