Figure 1.

Estimate of the average velocity (gray curve) of an individual in the MDC data over $t_{max}=21$ weeks. The dashed line indicates the value of $\hat{V}\left(t_{max}\right)$, and the two dotted lines represent the lower bound $(1-\gamma )\hat{V}\left(t_{max}\right)$ and the upper bound $(1+\gamma )\hat{V}\left(t_{max}\right)$ for $\gamma =0.1$. These bounds correspond with times τ for which the APE $\phi (V;\tau )\le \gamma$. The crosses denote the times τ for which $\phi (V;\tau )=\gamma$. The last crossing time for $\gamma =0.1$ is marked with a triangle and occurs at the end of week 10.