Bayesian sample size calculation

research methods design
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I would like to know

  1. what are important points to be considered when designing a study that plan to use Bayesian analysis, in general.
  2. Are there any guidelines to follow and online calculators or R packages.
  3. What are main difference in sample size calculation compared to frequentist approach.

I was wondering why we need to have sample size calculation apart from funding purpose when using Bayesian.

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Some material and several excellent references are here.

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