---
title: sum_y() | sum_x() | Tiger Data Docs
description: Calculate the sum from a two-dimensional statistical aggregate for the dimension specified
---

Since [1.3.0](https://github.com/timescale/timescaledb-toolkit/releases/tag/1.3.0)

Calculate the sum from a two-dimensional statistical aggregate for the given dimension. For example, `sum_y()` calculates the skewness for all the values of the `y` variable, independent of values of the `x` variable.

## Samples

Calculate the sum of the numbers from 0 to 100:

```
SELECT sum_y(stats_agg(data, data))
  FROM generate_series(0, 100) data;
```

```
sum_y
-----
5050
```

## Arguments

The syntax is:

```
sum_y(
  summary StatsSummary2D
) RETURNS DOUBLE PRECISION
```

```
sum_x(
  summary StatsSummary2D
) RETURNS DOUBLE PRECISION
```

| Name    | Type           | Default | Required | Description                                              |
| ------- | -------------- | ------- | -------- | -------------------------------------------------------- |
| summary | StatsSummary2D | -       | ✔        | The statistical aggregate produced by a `stats_agg` call |

## Returns

| Column | Type             | Description                                        |
| ------ | ---------------- | -------------------------------------------------- |
| sum    | DOUBLE PRECISION | The sum of the values in the statistical aggregate |