If you want to sum values across few series, there are two main ways to achieve this:

### 1. Formula language

You can sum multiple series by typing a simple expression with the '+' sign.

It will add up only common part for all series.

### 2. Cross Section analysis

Use the *Cross section* analysis to calculate a sum across series. This is a good option if you want to summarize a lot of series since you can easily include several series at once.

Cross section Sum option works the same as adding series using '+' sign. However, it is worth noting that the result will differ if you untick 'Include only observation where there are values for all series*' *option. Then Cross section will add values at all available points in time.

### Sum(series) formula

In case you want to sum values of one series *Sum(series)* formula will be helpful. It only sums the values of one series, the output would be a repeated value for all observations, because it returns the sum of all the numbers in the series.

For more about this check: