Λλ
MATHEMATICS
- Eigenvalues (λ).
- Lagrange multiplier (λ).
PROBABILITY
- Rate in Poisson/Exponential (λ).
- Intensity in Poisson processes.
STATISTICS
- Rate/regularization parameter (λ).
- Appears in GLMs/penalties (ridge/lasso).
PRONUNCIATION
- Ancient Greek
- sound [l]
- Modern Greek
- λάμδα [ˈlamða] · sound [l]
IN FORMULAS
- P(X = k) = λᵏ e^(−λ) / k!The Poisson distribution: λ is the average rate of events.See it explained at morrisonkuhlsen.com →
- Av = λvλ is an eigenvalue of the matrix A.
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Note: notations vary between books/fields; these are the most common usages.