It is a cross-sectional study to find out associations between specific factors and smoking behavior. Target population: 13 to 15 years old adolescents in school settings; the population size N=43.520
the sample size derived from given formulas (n>5000) is too big for a project which is to be conducted within the framework of a doctoral research
To calculate sample size in Survery, you need to determine the confidence interval and the margin error. The following link will calculate for you the sample size. best regards
http://www.surveysystem.com/sscalc.htm
With a two-stage cluster sample it is necessary to estimate the number of clusters needed and the number of people within each cluster. Depending on your specific research questions and other aspects of your situation, it is likely you be most useful to use simulation methods (e.g., the tables in Cohen's power books won't apply). A good place to start is http://www.bristol.ac.uk/cmm/software/mlpowsim/. Depending on your specific situation, you will likely have to tweak the code a bit (in either MLwiN or R).
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