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They allow joint analysis of two characteristics of the individuals in a population with the purpose of detecting possible relationships between them

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• seeks to determine the degree of relationship that exists between the two it is calculated with the coefficients of correlation
  • They are usually numbers that vary between +1 and -1. its magnitude indicates the degree of association between the variables, if it is 0 it indicates that there is no relationship and extreme values +1 -1 indicate a correlation perfect positive or negative respectively
    • positive
      • if by increasing or decreasing variable values independent increase or those of the dependent variable
    • negative
      • by increasing the values of the independent variable decrease variable values dependent or vice versa

Regresion

• It means the estimate of a variable based on another value known corresponding to the another variable