Koreliacija
Koreliacija is a statistical concept describing the degree to which two variables move together. The most common measure is the Pearson correlation coefficient, denoted r, which quantifies the strength and direction of a linear relationship. Its values range from -1 to 1: 1 indicates a perfect positive linear relationship, -1 a perfect negative linear relationship, and 0 effectively no linear relationship. If the relationship is non-linear, r may be small even when the variables are related.
In addition to Pearson r, non-parametric measures such as Spearman's rho and Kendall's tau assess monotonic
Interpreting koreliacija requires attention to several caveats. Correlation does not imply causation; two variables may move
Calculation is conceptually straightforward: r equals the covariance of X and Y divided by the product of