> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anlytic.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CumulativeVariance

Calculates the cumulative variance of values from the first row up to the current row within a partition.

**Category:** `window`

**Syntax:**

```
CumulativeVariance([column])
```

**Returns:** `Float`

**Context Filtering:** ✓ Yes

## Parameters

| Name     | Type     | Required | Description                                             |
| -------- | -------- | -------- | ------------------------------------------------------- |
| `column` | `column` | ✓ Yes    | The numeric column to calculate cumulative variance for |

**Allowed Column Types for `column`:** INT, FLOAT, DECIMAL, NUMBER

## Validation

* Minimum parameters: 1
* Maximum parameters: 1

## Examples

```
CumulativeVariance([Sales])
```

Returns the running variance of sales from the first row to the current row.

```
CumulativeVariance([Response_Time])
```

Calculates cumulative variance of response times, useful for tracking data dispersion over time.

## Related Functions

* [CumulativeStdDev](cumulativestddev) - Calculates cumulative standard deviation
* [MovingVariance](movingvariance) - Calculates moving variance with a window
* [Variance](../aggregate/variance) - Returns the overall variance
* [CumulativeAvg](cumulativeavg) - Calculates cumulative average