Nominal α [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2020-06-09 11:49 (313 d 11:47 ago) – Posting: # 21516
Views: 2,047

Hi arl_stat,

» Please help me to understand the alpha value considered for sample size estimation.

α is the nominal level of the test. In BE generally 0.05, which gives a two-sided 100 × (1 – 2α) = 90% CI. α is fixed by the authority, i.e., you are not free to choose it in sample size estimation.

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