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

# Lookback

> The Lookback dimension in FRTBCombinedCube, providing the hierarchy of historical dates used in retrospective measure calculations such as PLA metrics, IMCCavg, and expected shortfall averages

The **Lookback** dimension contains the following hierarchies:

<CardGroup cols={2}>
  <Card title="Lookback" href="../../lookback">List of historical dates contributing to the calculation of retrospective measures, such as PLA metrics, IMCCavg and others.</Card>
</CardGroup>