def data_check(self, participant):
return True<EOL>
Check that the data are acceptable.

        Return a boolean value indicating whether the `participant`'s data is
        acceptable. This is meant to check for missing or invalid data. This
        check will be run once the `participant` completes the experiment. By
        default performs no checks and returns True. See also,
        :func:`~dallinger.experiments.Experiment.attention_check`.