vastorbit.VastColumn.kurtosis¶

VastColumn.kurtosis() → Annotated[bool | float | str | timedelta | datetime, 'Python Scalar']¶

Calculates the kurtosis of the VastColumn to obtain a measure of the data’s peakedness or tailness. The kurtosis statistic helps us understand the shape of the data distribution. It quantifies whether the data has heavy tails or is more peaked relative to a normal distribution.

By aggregating the VastColumn with kurtosis, we can gain valuable insights into the data’s distribution characteristics.

Warning

To compute kurtosis, vastorbit needs to execute multiple queries. It necessitates, at a minimum, a query that includes a subquery to perform this type of aggregation. This complexity is the reason why calculating kurtosis is typically slower than some other types of aggregations.

Returns:: kurtosis
Return type:: PythonScalar

Examples

For this example, let’s generate a dataset and calculate the kurtosis of a column:

import vastorbit as vo

data = vo.VastFrame(
    {
        "x": [1, 2, 4, 9, 10, 15, 20, 22],
        "y": [1, 2, 1, 2, 1, 1, 2, 1],
        "z": [10, 12, 2, 1, 9, 8, 1, 3],
    }
)
data["x"].kurtosis()

Note

All the calculations are pushed to the database.

Hint

For more precise control, please refer to the aggregate method.