![]() ![]() The coefficient of correlation is also being used in the test construction. This question is answered by the magnitudes of the coefficient with various criteria. Whenever a test is constructed the tests, not what it claims to test. Through calculation of this statistics it has been sought to be asserted whether or not a test measures on two successive occasions the same type of thing.Ī test’s width value can be obtained through correlation. The co-efficient of correlation has been used very often to test the reliability. In a number of studies it is used to predict the success one will achieve in his further educational careers. The coefficient of correlation is used quite profitably in Prediction. Its specific uses may be given as follows: It expresses at one figure the average degree of resemblance etc., between the two traits. ![]() It is useful whenever each number of a group of individuals has been measured on two or more traits. In almost all social sciences this is now being increasingly used. The use of coefficient of correlation is very wide. ![]() 2 by saying that there is negligible positive correlation. In order to illustrate this formula, we give below an example: ∑D 2 represents the sum of the squares of differences in rank. P (rho) stands for coefficient of correlation from rank differences. The formula for calculating the correlation by Rank order method is as under: Similarly various advertisements colour combinations, jokes and picture which are difficult to evaluate numerically may be put in order of merit for beauty, humour, artistic quality or some other quality. For instance, individuals may be ranked in order of merit for obedience, industriousness, punctuality, honesty, salesmanship or social adjustment. Two methods that are prevalent and important are:-ĭifferences among individuals in many traits can often be expressed by ranking the subjects is 1 -2 – 3 order when such differences cannot be measured directly. Various persons have suggested various methods for finding out correlation. In order to provide educational guidance to a student in selection of his subjects of study, correlation is also helpful and necessary. With the help of it, it is also possible to have a knowledge of the various qualities of an individual.Īfter finding the correlation between the two qualities or different qualities of an individual, it is also possible to provide his vocational guidance. With the help of correlation, it is possible to have a correct idea of the working capacity of a person. Importance of Correlation:Ĭorrelation is very important in the field of Psychology and Education as a measure of relationship between test scores and other measures of performance. ![]() Zero correlation is a correlation showing no relationship, or a correlation having a correlation coefficient of zero. If the weight of an individual does not increase in proportion to increase in his height or if the weight of an individual decreases with an increase in height, then it is said to be negative correlation, also ranges from 0 to -1. It is just the opposite of positive correlation. When it is + 1, then there is perfect positive correlation. If it is 0 then there is no relation at all. If the weight of an individual increases in proportion to increase in his height, the relation between this increase of height and weight is called as positive correlation. “Correlation is a joint relationship between two variables.” Types of Correlation: ![]()
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