---
name: bollinger_bands
kind: function
lang: go
domain: finance
version: "1.0.0"
purity: pure
signature: "func BollingerBands(data []float64, period int, numStdDev float64) (upper, middle, lower []float64)"
description: "Calcula las bandas de Bollinger (upper, middle, lower) para una serie de precios."
tags: [finance, indicator, bollinger, bands]
uses_functions: []
uses_types: [bollinger_result_go_finance]
returns: [bollinger_result_go_finance]
returns_optional: false
error_type: ""
imports: [math]
params:
  - name: data
    desc: "slice de precios de cierre (ej: [22.5, 23.1, 22.8, ...])"
  - name: period
    desc: "período de la media móvil simple (ej: 5, 20, 50 días)"
  - name: numStdDev
    desc: "número de desviaciones estándar para las bandas (típicamente 2.0)"
output: "tupla (upper, middle, lower) - tres slices de precios banda superior, media (SMA) e inferior"
tested: false
tests: []
test_file_path: ""
file_path: "functions/finance/bollinger_bands.go"
---

# bollinger_bands

Calcula las bandas de Bollinger. La banda media es la SMA, y las bandas superior e inferior estan a `numStdDev` desviaciones estandar de la media. Usa desviacion estandar poblacional.

## Ejemplo

```go
upper, middle, lower := finance.BollingerBands(
    []float64{22, 24, 23, 25, 26, 28, 27, 29, 30, 28},
    5, 2.0,
)
```