coefficient of correlation

1. A statistic representing how closely two variables co-vary;
   It can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation) (synset 106041776)
   "what is the correlation between those two variables?"
   referred to in: statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
   is a type of: parametric statistic - any statistic computed by procedures that assume the data were drawn from a particular distribution
   subtypes:

   • pearson product-moment correlation coefficient, product-moment correlation coefficient - the most commonly used method of computing a correlation coefficient between variables that are linearly related
   • multiple correlation coefficient - an estimate of the combined influence of two or more variables on the observed (dependent) variable
   • biserial correlation, biserial correlation coefficient - a correlation coefficient in which one variable is many-valued and the other is dichotomous
   • chance-half correlation, split-half correlation - a correlation coefficient calculated between scores on two halves of a test; taken as an indication of the reliability of the test
   • tetrachoric correlation, tetrachoric correlation coefficient - a correlation coefficient computed for two normally distributed variables that are both expressed as a dichotomy
   same as: correlation, correlation coefficient

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