# When two variable character in the same series or

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When two variable character in the same series or individuals are measurable in quantitative units such as height and weight; temperature and pulses rate; age and vital capacity, circulating proteins in gms and surface area in square meters; systolic and diastolic blood pressure in mms of hg, it is often necessary and possible to know, not only whether there is any association or relationship between them or not but also the degree or extent of such relationship. Thus correlation refers to the relationship between two variable. Correlation is the statistical analysis which measures and analysis the degree or extents to which two variables fluctuate wi th reference to each other. The word “relationship” is of importance and indicates that there is some connection between the variables under observation. The correlation measures the closeness of the relationship between the variables. For instance the height and the weight are correlated because both will be increasing or decreasing. Correlation determines the relationship between two variables, but it does not prove that one particular variable alone causes the change in the other. The cause of change in the same or opposite direction may be due to other reacting factor or factors almost any association which is concerned directly or indirectly with the human element is likely to be imperfect and cannot be accurately determined like a functional relationship. Inadequacy of information and in accurate of various types may not let us determine the degree of association properly. All the same it is possible to by means of correlation and regression methods in statistics. Functional relationships are usefully employed in physical sciences to study the degree of association between variables and the laws connecting them. In social science functional relationships cannot be utilized since exact relationships between statistical variables do not exist in general. Correlation is a statistical device to measure the amount of similarity and variations. Definition Some important definition of correlation is given below. “Correlation analysis deals with the association between two or more variables” Simpson and Kafka. “Correlation analysis attempts to determine the degree of relationship between variables” – Ya Luncho.

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149 “If two or more quantities vary in sympathy so that movements in one tend to be accompanied by corresponding movements in the others items they are said to be correlated” - L.R.Conner. “Correlation means that between two series on group of data there exists some casual connection” - W.I.King. 17.2. OBJECTIVES To learn how many business decisions depend on knowing the specific relationship between two or more variables.
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• Spring '12
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