Erratum: Jamšek et al. Gaussian Mixture Models for Control of Quasi-Passive Spinal Exoskeletons. Sensors 2020, 20, 2705

There was an error in the original article [1]. The variable used for the superscript in the denominator of the equation, denoting the dimensionality of the model, was incorrectly written as K and thus conflicted with the variable denoting the number of Gaussian mixtures. A correction has therefore been made to Section 2.3, Equation (4):

$$p_j\left(\mathit{x}\right)=\sum _{k=1}^K{\tau }_k\left(\frac{e^{-\frac{1}{2}{(\mathit{x}-{\mathit{\mu }}_k)}^T{\mathsf{\Sigma }}_k^{-1}(\mathit{x}-{\mathit{\mu }}_k)}}{\sqrt{{\left(2\pi \right)}^D\left|{\mathsf{\Sigma }}_k\right|}}\right),$$ (4)

where D is the dimensionality of the model (6 in our case).