Changes

While those mental heuristics are nice for having an intuition, they are a bit limited as it's hard to update my own expectations of what is normal and it's nearly impossible to make a prediction that's not based on looking at individual metrics. That's why I wondered: '''Can I come up with a rule of thumb that can be put into code for making a better heuristic?'''

While those mental heuristics are nice for having an intuition, they are a bit limited as it's hard to update my own expectations of what is normal and it's nearly impossible to make a prediction that's not based on looking at individual metrics. That's why I wondered: '''Can I come up with a rule of thumb that can be put into code for making a better heuristic?'''

Given that my own mental approach was just looking at "abnormal deviations from my expectation" I decided to just go with the more statistical concept of looking at standard deviation (σ), which measures  the degree to which individuals within the sample differ from the sample mean<ref>https://en.wikipedia.org/wiki/Standard_deviation</ref>. By looking at the standard deviation for those values, I acn establish what the "normal" range for each of the four metrics of interest (resting heart rate, heart rate variability, body temperature) would be.

Given that my own mental approach was just looking at "abnormal deviations from my expectation" I decided to just go with the more statistical concept of looking at standard deviation (σ), which measures  the degree to which individuals within the sample differ from the sample mean<ref>https://en.wikipedia.org/wiki/Standard_deviation</ref>. By looking at the standard deviation for those values, I can establish what the "normal" range for each of the four metrics of interest (resting heart rate, heart rate variability, body temperature) would be.