+1: If it is +1, then variables are known as perfectly positively correlated.0: That means the variable is not having any correlation.That means if one variable is moving in one direction, another is moving in the opposite direction. -1: If it is -1, then variables are known as perfectly negatively correlated.The value of correlation is limited between -1 and +1 and can be interpreted as follows: One can calculate it by summation of the product of the sum of the first variable minus the mean of the first variable into a sum of the second variable minus the mean of the second variable divided by the whole under the root of the product of the square of the first variable minus mean of the first variable into the sum of the square of second variable minus mean of the second variable. One may define it as the change of quantity in one variable corresponding to a change in another. Correlation is a statistical measure between two variables.
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