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.
Spearman's correlation coefficient measures correlation when the data is non parametric, when either x or y is not a continuous and normally distributed measurement. An example of this is correlation between Likert Scales, a 5 step close ended measurement often used in social sciences.pearman's correlation coefficient measures correlation when the data is non parametric, when either x or y is not a continuous and normally distributed measurement. An example of this is correlation between Likert Scales, a 5 step close ended measurement often used in social sciences.