nr</code> operates for the most part on
individual subjects one at a time, however, this issue might be
mitigated by splitting the input data into many small files, then
running <code>growthcleanr</code> separately on each file, with results
re-combined at the end. The primary benefit of this strategy would be
the saving of the results of each file as it completes, allowing a
researcher whose job fails overnight to resume processing on only the as
yet incomplete input files. A secondary benefit might be a s