Answer to Question #215723 in Economics for mickey

Question

1.     Write short not on the following

 (a) Spurious correlation

 (b) Positive and negative correlation

 (c) Linear and non-linear correlation

 (d) Simple, multiple and partial correlation 

Answer 1

(a) false correlation

False correlation occurs when two independent (from each other!) Quantities change synchronously or almost synchronously. Trying to calculate the correlation coefficient will give a very high and often very reliable value.

 (b) Positive and negative correlation

The directional correlation can be positive (direct) and negative (inverse). A positive straight-line correlation is characterized by the fact that higher values ​​of the basic attribute correspond to higher values ​​of the secondary, and lower values ​​of one attribute correspond to lower values ​​of the other.

 (c) Linear and nonlinear correlation

A linear relationship is characterized by the fact that equal changes in one quantity correspond to equal changes in the mean values ​​of another quantity. For example, there is a correspondence between changes in the levels of systolic and diastolic blood pressure. For nonlinear communication, it is characteristic that equal changes in one quantity correspond to unequal changes in the average values ​​of another quantity.

 (d) Simple, multiple and partial correlations

Pairwise correlation is a connection between two characteristics (effective and factorial, or two factorial).

Partial correlation is the dependence between the effective and one factorial trait with a fixed value of other factorial traits.

Multiple correlations are the dependence of the effective and two or more factor signs included in the study.