*4.3. Dashboard*

In addition to the backend, we designed a dashboard that provides a way to visualize the data about the runs. The dashboard can be accessed on the web using a browser. Figure 4 depicts an example plot of cadence data for three different runs by three different subjects. In the runs reported in Figure 4, runner s28ikk reported holding the phone in his hand during run 11, contrary to the instructions given to the subjects to place the smartphone around the hip or on the shoulder during the run. In all of the runs in the figure, we observe that the runners stopped momentarily, which is corroborated by the other data variables (e.g., speed, GPS, etc.). This explains the seemingly low cadence readings in these figures. These issues will be discussed further in Section 5.

The paths of the runs can also be visualized with a colored overlay, representing the recorded values from various data sources, such as cadence, speed, or heart-rate. For example, the dashboard can provide a plot of the path of the run with the color from green to red indicating the value of cadence (range: zero to 200), as depicted in Figure 5.

**Figure 4.** An example plot from the dashboard, depicting the estimated cadence during runs 11, 22 and 26 by subjects s28ikk, p542ok and i989kje, respectively [11].

**Figure 5.** An example plot of the path of run 47 by subject p542ok.
