correlation and its types -ppt

Detailed ppt on correlation and its types

1. TOPIC : INTRODUCTION OF CORRELATION PRESENTED BY: MEHARLEEN KAUR PUPIL-TEACHER ROLL NO. : 26

2. MEANING OF CORRELATION

3. TYPES OF CORRELATION :

4. POSITIVE CORRELATION A positive correlation exists when one variable decreases as the other variable decreases, or one variable increases while the other increases A positive correlation is a relationship between two variables that tend to move in the same direction. Example : Salary and Expenditure

5. NEGATIVE CORRELATION Negative correlation is a relationship between two variables in which one variable increases as the other decreases, and vice versa. Negative correlation describes when two variables tend to move in opposite direction. Example : Price of an article and its Demand

6. SIMPLE CORRELATION When we study the association between two variables it is called Simple Correlation .

7. PARTIAL CORRELATION When we study the association between two variables only while there are given more than two variables . Example : Given variables x,y,z We take only x & y ignoring z OR We take only y & z ignoring x OR We take only x & z ignoring y OR MULTIPLE CORRELATION When we are given more than two variables and we study association between one variable and other variables together . Example : Given variables x,y,z We study association between X & Y together Or Y & Z together

8. LINEAR CORRELATION & NON-LINEAR CORRELATION Correlation is said to be linear if the ratio of change is constant between the two variables . Example : When the amount of output in a factory is doubled by doubling the number of workers, this is an example of linear correlation. Correlation is said to be non-linear if the ratio of change is not constant between the two variables .

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