Technique consisting in the construction of multiple decision trees and the aggregation of their outputs (e.g., mean or median value) as a final output.

A nonparametric regression technique. It aims at calculating the parameter of the probability function of the value of the criteria given the predictors.

A method similar to Neural Network, in which the connections between neurons are not learned through backpropagation, but are calculated directly like in linear regression.

A family of machine learnings technique inspired by the human brain. A neural network is made of layers of neurons and connections between the predictors, the neuron layers, and the outcome variables. The algorithm is tuned through backpropagation during the training phase to optimize the values of the strength of the connections.

Family of probabilistic machine learning which calculates the conditional probability of each possible value of the criteria, given the value of the predictors. Compared to simpler Bayesian approaches, Bayesian Networks include a representation of the relations between predictors.

In machine learning, the ensemble of techniques aims to use a linear combination of predictors to build a sigmoidal probability function of the value of a categorical criterion.

Classification technique which aims at individuating in multidimensional spaces of variables values areas delimited by multidimensional hyperplanes in which the target variable is likely to have a certain value.

Jitter and shimmer are measures of disturbance of the speech soundwave. Higher jitter corresponds to a rougher voice, while higher shimmer refers to breathiness and noise emission.

Is a measure of the rate of change of the soundwave. It summarizes information about the changes in pitch and formant.

A formant is a concentration of acoustic energy around a frequency. The first formant is concentrated around the lowest frequency, and the next ones are concentrated around higher frequencies. They are related to acoustic characteristics of speech such as, for example, the openness of vowels.

The speed of speech production, usually calculated as words per minute.

Pitch is the measure of the frequency of a soundwave. It indicates if a voice is deep or acute.

Energy is a measure of the volume of speech.

Pitch is the measure of the frequency of a soundwave. It indicates if a voice is deep or acute.

Classified actions of facial muscles corresponding to the unique smallest independent movements.

The average amount of movement of the pixels in a specific region of a video (e.g., a face), corrected for the overall movement of that region in the space.