'returns text summarizing the results
uses the default pvalue correction of the instance stored in
``self.multitest_method``'

def summary(self):

    import statsmodels.stats.multitest as smt
    maxlevel = max((len(ss) for ss in self.all_pairs_names))
    text = ('Corrected    p-values    using    %s    p-value    correction\n\n' % smt.multitest_methods_names[self.multitest_method])
    text += (('Pairs' + ('    ' * ((maxlevel - 5) + 1))) + 'p-values\n')
    text += '\n'.join((('%s        %6.4g' % (pairs, pv)) for (pairs, pv) in zip(self.all_pairs_names, self.pval_corrected())))
    return text
