What do your really mean by Correlation?

Meaning

In statistics correlation refers to relationship between any two or more variables like height and weight, rainfall and yield, price and demand, income and expenditure etc. Two variables are said to be correlated if with a change in the value of one variable there arises a change in another variable and vice-versa.

Definitions

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According to Croxton and Cowden,

“When the relationship is of a quantitative nature, the appropriate statistical tool for discovering and measuring the relationship and expressing it in a brief formula is known as correlation.”

According to Ya Lun Chou,

“Correlation analysis attempts to determine the degree of relationship between variables.”

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According to A.M. Tuttle,

“Correlation is an analysis of the covariation between two or more variables.”

According to W.I. King,

“Correlation means that between two series or groups of data there exists some casual connection.”

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Thus, from the above definitions, we can say that statistical technique with the help of which we study the extent, nature and significance of association between the two or more variables is known as correlation.