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A study of married couples showed that the longer they had been married, the more similar their opinions on social and political issues were positive correlation.
A positive correlation is a relationship between two variables that have a tendency to transport within the same direction. A wonderful correlation exists whilst one variable tends to lower as the other variable decreases, or one variable tends to increase when the other increases. A positive correlation exists whilst variables flow inside the equal direction as one another. A simple example of positive correlation is height and weight—taller humans tend to be heavier, and vice versa. In some cases, positive correlation exists because one variable influences the other. Correlation is expressed on a range from +1 to -1, called the correlation coefficent. In a perfect effective correlation, expressed as +1, an increase or decrease in one variable always predicts the same directional change for the second variable. If variables sometimes but not always change in tandem, the correlation is expressed as greater than zero but less than +1. Values beneath zero specific negative correlation: as the value of one variable increases, the other decreases. 0 indicates a lack of correlation: there is no tendency for the variables to fluctuate in tandem either positively or negatively.
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