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.
A leading coefficient is the coefficient of a term with the highest degree, or largest exponent, within an equation. For example, the degree of the equation 6y^4 + 5y^2 - 2y + 1 is 4, because that is the largest exponent. Therefore, the leading coefficient is 6.