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.
In statistics, correlation is connected to the concept of dependence, which is the statistical relationship between two variables. The Pearsonâs correlation coefficient or just the correlation coefficient r is a value between -1 and 1 (-1â¤râ¤+1).It is the most commonly used correlation coefficient and valid only for a linear relationship between the variables.If r=0, no relationship exist, and if râ¥0, the relation is directly proportional; the value of one variable increases with the increase in the other.t is the most commonly used correlation coefficient and valid only for a linear relationship between the variables. If r=0, no relationship exist, and if râ¥0, the relation is directly proportional; the value of one variable increases with the increase in the other.