Before revision:  A random forest classifier with spectral densities of linear acceleration and angular velocity was built to classify different types of head impacts (e.g., football , MMA ), reaching a median accuracy of 96\% over 1000 random partitions of training and test sets.
After revision:  A random forest classifier with spectral densities of linear acceleration and angular velocity was built to classify head impact types (e.g., football , MMA ), reaching a median accuracy of 96\% over 1000 random partitions of training and test sets.