Sleep related groaning, also called catathrenia, causes you to groan vocally while you sleep. Sleep related groaning is a long-lasting disorder that often occurs nightly. The groaning sound is usually quite loud. Your breathing becomes unusually slow during a groaning episode. You take in a slow, deep breath.
The Gini coefficient (or Gini ratio) is a summary statistic of the Lorenz curve and a measure of inequality in a population.he Gini coefficient (or Gini ratio) is a summary statistic of the Lorenz curve and a measure of inequality in a population.
The Gini coefficient is most easily calculated from unordered size data as the relative mean difference, i.e., the mean of the difference between every possible pair of individuals, divided by the mean size , (Dixon et al. 1987, Damgaard and Weiner 2000).