# correlation

Correlation is the interrelationship between two or more variables. It is decisive for the dependence of one variable on another. If a direct relationship of one variable to another can be determined, then the correlation is high, in the other case, if no interrelationships exist, the correlation is low. The measure of correlation is expressed in the correlation coefficient

. Inelectronics, for example, there are direct correlations between the temperature and the resistance value of the thermistor in the case of thermistors, or between the incident light

and the resistance value in the case ofphotoresistors

.If there is a linear relationship between the relationships, this is a linear correlation; if there is a non-linear relationship, it is a non-linear corre

lation. If there isa similar relationship between the relationships, for example, if the resistance value increases with increasing temperature, then it is a positive correlation, which is reflected in a positive correlation factor, if the relationship is opposite - for example, if the resistance value decreases with increasing temperature - then the correlation is negative.

Correlation techniques are used in programming, compression methods and statistics, among other things.