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How to determine whether the number of data required to be taken for a experiment?

eg: I need to take a set of data for the noise mapping, how many should I take ?

koksiang100
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  • See this question for more resources you can use to calculate the required sample size: http://stats.stackexchange.com/questions/63391/free-internet-or-downloadable-resources-for-sample-size-calculations/63392 – Silverfish Dec 02 '14 at 09:18

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This is connected to power analysis, that enables you to estimate a desirable sample size for analysis. There are different methods for different statistical tests, here you can find a tutorial on using pwr R package for t-test. In Spiegelhalters et al. book you can find examples of dealing with this kind of problems in Bayesian fashion.

Tim
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