variance
Calculate the rolling variance of a target column within a given window size.
Variance measures the dispersion of a set of data points around their mean. It is a key metric for assessing the volatility and stability of financial returns or other time series data over a specified rolling window.
Example
from openbb import obb
stock_data = obb.equity.price.historical(symbol="TSLA", start_date="2023-01-01", provider="fmp").to_df()
returns = stock_data["close"].pct_change().dropna()
obb.quantitative.rolling.variance(data=returns, target="close", window=252)
Parameters
- standard
| Name | Type | Description | Default | Optional |
|---|---|---|---|---|
| data | List[Data] | The time series data as a list of data points. | False | |
| target | str | The name of the column for which to calculate variance. | False | |
| window | int | The number of observations used for calculating the rolling measure. | 21 | False |
| index | str | The name of the index column, default is "date". | date | False |
Returns
OBBject
results : List[Data]
An object containing the rolling variance values.