'Return test run statistics as tuple:
(minimum run time,
average run time,
total run time,
average time per operation,
minimum overhead time)'

def stat(self):

    runs = len(self.times)
    if (runs == 0):
        return (0.0, 0.0, 0.0, 0.0)
    min_time = min(self.times)
    total_time = sum(self.times)
    avg_time = (total_time / float(runs))
    operation_avg = (total_time / float(((runs * self.rounds) * self.operations)))
    if self.overhead_times:
        min_overhead = min(self.overhead_times)
    else:
        min_overhead = self.last_timing[2]
    return (min_time, avg_time, total_time, operation_avg, min_overhead)
