t calculate the summary metrics in these
data. Further, it is often unknown how exactly these metrics are
calculated. To refer to these metrics GGIR uses the terminology as
listed below:</p>
<table class="table">
<colgroup>
<col width="48%">
<col width="52%">
</colgroup>
<thead><tr class="header">
<th>Metric name</th>
<th>Description</th>
</tr></thead>
<tbody>
<tr class="odd">
<td>ExtAct</td>
<td>Externally derived indicator of activity. Typically counts, but for
Fitbit these are estimated calories and for 