# Historical Compression

**URL:** <https://forum.inductiveautomation.com/t/historical-compression/6816>\
**Category:** Ignition\
**Created:** [July 4, 2013, 7:04pm UTC](https://forum.inductiveautomation.com/t/historical-compression/6816 "2013-07-04T19:04:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![allenr8](https://avatars.discourse-cdn.com/v4/letter/a/e56c9b/32.png) [@allenr8](https://forum.inductiveautomation.com/u/allenr8)\
**Post date:** [July 4, 2013, 7:04pm UTC](https://forum.inductiveautomation.com/t/historical-compression/6816/1 "2013-07-04T19:04:12Z")

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Just a quick question about the compression - it wasn’t super clear in the manual, but if I use an analog mode and then use the percent deadband method - what is that a percentage of?

The range of my tag defined in metadata?  
The range specified in Numeric?

Just curious - don’t think I am setting them up right because I am getting more records than I like.

Thanks

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**Author:** ![Ron.Lor](https://avatars.discourse-cdn.com/v4/letter/r/f17d59/32.png) [@Ron.Lor](https://forum.inductiveautomation.com/u/Ron.Lor)\
**Post date:** [August 14, 2013, 10:25pm UTC](https://forum.inductiveautomation.com/t/historical-compression/6816/2 "2013-08-14T22:25:10Z")

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It’s the percentage change between the engineering limits defined on the tag