Notify me on significant change (need help)

[Xenoix (Shane Brown)]

Hi there! Relative newbie here on an unusually cold day.
I’m wondering how to set up a morning trigger to check if a new value is outside 1 standard deviation from the mean of the previous 7 days.
Not sure where to start here, would anyone be able to help me?

[serkank]

maybe you can start from here: node-red-contrib-statistics (node) - Node-RED

[obaldius]

This thread will help

Node Red: How to start / stop fan at different humidity level bathroom

Make sure you’ve set up the statistics on your humidity sensor long enough beforehand (several days) so that it can have a good value for the mean and std deviation. The beauty of this approach is that you don’t need to care about the actual humidity level (60%, 70%, etc). You’re only concerned with having it trigger when it raises above the norm, and it only adds run-time while the humidity is increasing and stops adding minutes as soon as the humidity drops.