Fig. 2. An example of the gait speed probability density function (pdf) for one of the patients (P6).

The distribution is shown at (a) home and (b) at the clinic. The red fitted curves are the first and second terms of the bimodal Gaussian distribution introduced by Eq. 1, the parameters $c_1$, $c_2$, ${\mu }_1$, ${\mu }_2$, ${\sigma }_1$, and ${\sigma }_2$ are the Gaussian mixture model parameters defined in Eq. 1.