How to make an accurate algorithm to calculate drops and bumps of a phone's accelerometer?

Question

Apache Cordova

I make applications on apache Cordova such as a panic button, which calculates a person's falls or pushes. I met a lot of open-projects on github, but they are all inaccurate, because. a lot depends on where the phone itself is during the fall - in hands, jeans pocket, jacket, etc.
My goal is to achieve at least % 80 accuracy ... Who has any thoughts? I have a rough formula for pushing and falling, but they are different in nature and mutually exclusive... there are many more options
Need a link to research in this area to derive a digestible algorithm from it