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add natural cycles announcement
The '''''trend view''''' of the body temperature is a bit more complicated. Oura states that "the trend view displays a weighted average of how your body temperature varies from your baseline based on a three-day window" and that "days closed to the current date will have more of an impact on your readings"<ref>https://support.ouraring.com/hc/en-us/articles/360055983614-Trends</ref>. Oura does not disclose the details of how the weighting of records is done and as such it is not possible to really understand or recreate how the company arrives at these values. One observation is that the ''trend'' values tend to be slightly biased towards positive values, probably as the distribution of possible body temperatures is not fully normally distributed, but rather censored on the lower end<ref>https://www.reddit.com/r/ouraring/comments/v6zirx/how_is_temp_trend_always_positive/ibl6vy1/</ref>.
The '''''trend view''''' of the body temperature is a bit more complicated. Oura states that "the trend view displays a weighted average of how your body temperature varies from your baseline based on a three-day window" and that "days closed to the current date will have more of an impact on your readings"<ref>https://support.ouraring.com/hc/en-us/articles/360055983614-Trends</ref>. Oura does not disclose the details of how the weighting of records is done and as such it is not possible to really understand or recreate how the company arrives at these values. One observation is that the ''trend'' values tend to be slightly biased towards positive values, probably as the distribution of possible body temperatures is not fully normally distributed, but rather censored on the lower end<ref>https://www.reddit.com/r/ouraring/comments/v6zirx/how_is_temp_trend_always_positive/ibl6vy1/</ref>.
==== Use for menstrual cycle tracking ====
The rings of the 3rd generation include an Oura internal beta-test for cycle tracking. Furthermore, since mid-2022 the ''[[Natural Cycles]]'' app – a cycle tracking app that's cleared for use as birth control – can use the temperature data from the ring as main input to predict fertile time windows<ref>https://www.naturalcycles.com/oura</ref>.
== Exporting data==
== Exporting data==