Αα
MATHEMATICS
- Angle/constant in formulas.
- Parameter in functions and series.
PROBABILITY
- Shape parameter in Beta/Gamma distributions (common convention).
- Significance level in hypothesis tests (α).
STATISTICS
- Significance level (α) and Type I error.
- Can appear as a model/ hyper-parameter.
PRONUNCIATION
- Ancient Greek
- sound [a]
- Modern Greek
- άλφα [ˈalfa] · sound [a]
IN FORMULAS
- P(rejeitar H₀ | H₀ verdadeira) = αα is the Type I error rate: the chance of rejecting a true null hypothesis.See it explained at morrisonkuhlsen.com →
- IC de 1 − α: x̄ ± z₍α/2₎ · σ/√nA confidence interval at level 1 − α (95% when α = 0.05).See it explained at morrisonkuhlsen.com →
HOW TO WRITE IT — click to copy
lowercase
uppercasesame as the Latin letter: LaTeX has no command for it
Note: notations vary between books/fields; these are the most common usages.