> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt.md).

# Trajectory Visualization Tool (TVT)

The Trajectory Visualization Tool (TVT) is a [**glyph-based visualization tool** for health trajectories](https://ieeexplore.ieee.org/document/10017872).

### TVT is designed to:

* understand **how** health register **data changes over time**
* **visualize large numbers** of longitudinal cases
* facilitate the **understanding** of **cohorts and concept sets** created with [Atlas](/working-in-the-sandbox/which-tools-are-available/atlas.md) (or with any other tool) when provided as a list of FinnGen IDs

### Glyphs in TVT

TVT uses a six-segment glyph to show the trajectories of six variables. A glyph in TVT is a bar plot of six variables for each person in the cohort with time on the x-axis. All event dates are randomized to have +/- 1 to 15 days, due to privacy regulations.

### Instructions and tutorials

* [Run TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/trajectory-visualization-tool-tvt.md)
  * [Filter timelines with TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/trajectory-visualization-tool-tvt/filtering-timelines-with-tvt.md)
  * [Reorder timelines with TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/trajectory-visualization-tool-tvt/reordering-timelines-with-tvt.md)
  * [Cluster timelines with TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/trajectory-visualization-tool-tvt/clustering-timelines-with-tvt.md)
  * [View results from TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/trajectory-visualization-tool-tvt/viewing-tvt-results.md)
* [View Atlas, CO, and Genotype cohorts in TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/viewing-atlas-co-and-genotype-cohorts-in-tvt.md)
* [Export cohorts from TVT](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/exporting-cohorts-from-tvt.md)
* [TVT help page](/working-in-the-sandbox/which-tools-are-available/trajectory-visualization-tool-tvt/tvt-help-page.md)

A **tutorial video** about TVT available from [FinnGen data users meeting 22nd Feb 2022](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-22nd-feb-2022) recording at 38min 09sec. See also an [Example workflow for survival time/endpoint analysis](/working-in-the-sandbox/general-workflows-for-the-most-common-analyses.md).

See also a [presentation of New FinGen tools and their application to example diseases from User's meeting 28th March 2023 recording ](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-28th-march-2023)(at 25min 23sec) including usage of Trajectory Visualization Tool.