__Perfect Correlation__:

If there is any change in the value of one variable, the value of the others variable is changed in a fixed proportion, the correlation between them is said to be perfect correlation. It is indicated numerically as and .

__Perfect Positive Correlation__:

If the values of both the variables are move in same direction with fixed proportion is called perfect positive correlation. It is indicated numerically as .

__Perfect Negative Correlation__:

If the values of both the variables are move in opposite direction with fixed proportion is called perfect negative correlation. It is indicated numerically as .

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