# A and B channel Confidence Score

**URL:** <https://community.purpleair.com/t/a-and-b-channel-confidence-score/7894>\
**Category:** Data\
**Created:** [January 31, 2024, 8:04pm UTC](https://community.purpleair.com/t/a-and-b-channel-confidence-score/7894 "2024-01-31T20:04:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Katie\_Beck](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/katie_beck/32/4359_2.png) [@Katie\_Beck](https://community.purpleair.com/u/Katie_Beck)\
**Post date:** [January 31, 2024, 8:04pm UTC](https://community.purpleair.com/t/a-and-b-channel-confidence-score/7894/1 "2024-01-31T20:04:29Z")

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Hello, I am working on a project and trying to describe data validation using purple air sensors. What formulas are used to determine the confidence score between the A and B channels. We would like to run our own calculations and compare. How often is the confidence score updated/calculated? I saw the score on the map, does this mean it is updated in real time?

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**Author:** ![Kieran](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/kieran/32/6220_2.png) [@Kieran](https://community.purpleair.com/u/Kieran)\
**Post date:** [February 8, 2024, 11:43pm UTC](https://community.purpleair.com/t/a-and-b-channel-confidence-score/7894/2 "2024-02-08T23:43:31Z")

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Hi @Katie_Beck

The confidence score is calculated based off of the agreement between the A and B channels in a device. It updates whenever a device outputs a new dataset. If you’re looking at realtime data on the map, the confidence score will update in realtime.