ruby - What algorithm can be used for alerting unusual trends? -


i looking algorithm detect when stream of data showing usual trend.

for example: logging bookings, , on last couple of weeks have been stable usual ups , downs. payment provider stops working, , within hours bookings decline drastically. catch minimise false alerts, , solution should adapt long term decline.

graph example

what statistical approach problem?

what name of such algorithm?

i think might interested in unsupervised anomaly detection algorithms.

a quick google search found tutorial. if have time, register machine learning course on coursera.


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