// In header: <boost/accumulators/statistics/extended_p_square.hpp>

struct extended_p_square : public boost::accumulators::depends_on< count >,
                           public extended_p_square_probabilities
{
  // types
  typedef accumulators::impl::extended_p_square_impl< mpl::_1 > impl;
  // public data members
  static boost::parameter::keyword< tag::probabilities > const probabilities;  // tag::extended_p_square::probabilities named parameter 
};