1. A method, implemented by one or more devices, comprising: receiving, by the one or more devices and from a plurality of personal emergency response (PER) devices, data relating to acceleration events that occurred at the PER devices; associating, by the one or more devices, the data relating to the acceleration events with indications of whether the data relating to the acceleration events corresponds to fall events of users of the PER devices; training, by the one or more devices, a classification model based on the data relating to the acceleration events and the indications of whether the data relating to the acceleration events corresponds to the fall events; and transmitting, by one or more devices, the classification model to at least some of the PER devices to update a previous version of the classification model at the at least some of the PER devices.