fn_registry/python/functions/finance/bollinger_bands.md

name, kind, lang, domain, version, purity, signature, description, tags, uses_functions, uses_types, returns, returns_optional, error_type, imports, tested, tests, test_file_path, file_path

name	kind	lang	domain	version	purity	signature	description	tags	uses_functions	uses_types	returns	returns_optional	error_type	imports	tested	tests	test_file_path	file_path
bollinger_bands	function	py	finance	1.0.0	pure	def bollinger_bands(data: list, period: int, num_std: float) -> tuple	Calcula las Bandas de Bollinger (upper, middle, lower) de una serie de precios.	finance bollinger volatility indicator python	sma_py_finance			false			false			python/functions/finance/finance.py

Ejemplo

prices = [10, 11, 12, 13, 14, 15, 14, 13, 12, 11]
upper, middle, lower = bollinger_bands(prices, 5, 2.0)
# middle es la SMA(5), upper/lower son middle +/- 2*std

Notas

Retorna tupla de tres listas (upper, middle, lower). Cada lista tiene len(data) - period + 1 elementos. La desviacion estandar se calcula sobre la ventana de tamanio period (poblacional, no muestral). Usa internamente la funcion sma para la banda media.