held constant
throughout the recording, GGIR never mixes epoch lengths because epoch
the length affects the interpretation of its value. It is like reading
an overview article about car speeds that alternates the unit of speed
in every sentence (i.e., miles per hour, meters per second, km per hour,
etc).</li>
<li>In GGIR part 5, the user has the option to aggregate all epochs to 1
minute length with parameter <code>part5_agg2_60seconds</code>. For
example, when using 5 second epochs in parts 1, 2, 3 and 4, 