Correlation — Economics STD 11 Commerce — Question

Simple Correlation: When there are only two variables involved in a problem, it is called simple correlation. For example, study of correlation between height and weight is simple correlation.
Partial Correlation: when we study two variable keeping some other variables which have an influence constant, it is called partial correlation. For example, if we study price rise with reference to only crop failure, keeping other factors like external factors, government policies constant, it is partial correlation.
Multiple Correlation: When we study relationship between two or more variables simultaneously, it is called multiple correlation. For example, study of price rise with crop failure and weaknesses of government policies.