Correction to: Liu et al. detection of human fall using floor vibration and multi-features semi-supervised svm. sensors 2019, 19, 3720

The authors wish to add one reference [1] to this paper [2]. On page 1, the original sentences are as follows: Progress toward new methods without cameras has been made through the use of accelerometer sensors mounted on the structure to capture floor vibration for human activities detection [13–15]. Correction to be: Progress toward new methods without cameras has been made through the use of accelerometer sensors mounted on the structure to capture floor vibration for human activities detection [13–16]. The sequential references originally in the paper (i.e., [16–47]) will shift by one (i.e., [17–48]). The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. The original article has been updated.