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

# Filtering the results

> Isolating a subpopulation and analyzing its results separately.

A **filter** restricts the results to a **subtarget**: a part of the sample, defined by one or several answers. For example: displaying only the women, or the under-35s. The base is recalculated on this subtarget.

## Applying a filter

The filters already available are displayed directly on your results (e.g. men / women).

<Steps>
  <Step title="Choose a filter">
    Click the filter you want among those offered.
  </Step>

  <Step title="Read the subtarget">
    The base updates: the number of individuals displayed drops to the size of the subtarget. You now read the number of individuals in this subpopulation, and no longer all the respondents.
  </Step>

  <Step title="Go back to Overall">
    Click **Overall** to get the full base back.
  </Step>
</Steps>

<Tip>
  You can **combine several filters** to narrow the subtarget: by adding a second criterion to a filter already applied (for example the men, **then** the Paris region), the base narrows further. Each added filter refines the subpopulation.
</Tip>

<Note>
  The filtered subtarget is kept in the **export**: a flat table exported to Excel keeps the active filter. See the **Exporting your deliverables** page.
</Note>

## Choosing the available filters

You decide which questions serve as filters. Any question of the questionnaire can be added.

<Steps>
  <Step title="Open the filter management">
    Via the pencil icon, click **Manage filters**. You land in the results preferences.
  </Step>

  <Step title="Select the questions">
    Check the questions to offer as filters; uncheck the ones to remove.
  </Step>

  <Step title="Confirm">
    The filters you choose become available on all the results.
  </Step>
</Steps>

<Note>
  A filter can be based on a question of the questionnaire **or** on a variable you created (a recode, for example "familiar / not familiar").
</Note>

## Filtering a wave comparison

For a filter to work in a comparison of several waves, it must exist on **each** wave and carry the **same variable name**. See the **Comparing surveys or questions** page.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.