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.
Kendall Rank Coefficient The correlation coefficient is a measurement of association between two random variables. While its numerical calculation is straightforward, it is not readily applicable to non-parametric statistics. 1  For example, in the data set survey, the exercise level (Exer) and smoking habit (Smoke) are qualitative attributes. 2  A more robust approach is to compare the rank orders between the variables.