# Overview

The *Performance* analysis allows you to see how a time series has changed in relation to some point in the past. It’s different from the rate of change analysis in that performance calculates the change *from* a specific point in time, whereas rate of change calculates changes *over* time.

# Settings

## Changed since, date and period

Specify the period in which to calculate performance.

*Please note that the performance will be calculated relative to the first value before the specified starting point**.*

### Year to date, Quarter to date, Month to date, Week to date

- Calculate the performance during a year, quarter, month or week
- Enter a date to select a specific period
- If no date is specified, the last period of the series will be used

### Years back, Quarter back, Months back, Weeks back

- Calculate the performance in the last years, quarters, months or weeks
- Specify the number of periods back at which to start the calculation

### Specific date

- Calculate the performance starting at a specific date until the end of the series

## Method

Select whether to measure performance as a *percentage change*,* value* or *logarithmic change*.

### Value

Calculate the change in value over the time.

$y\left(t\right)=z\left(t+h\right)-z\left(t\right)$### Percentage

Calculate the percentage change over the time.

### Logarithm

Calculate the logarithmic percentage change over the time.

# Example

We calculated the percentage change since the beginning of the year for a group of equity indices using the performance analysis. We selected *year to date* under change since and *percentage* under method.