# Perfect Correlation

__Perfect Correlation__

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

__Perfect Positive Correlation__

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

__Perfect Negative Correlation__

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