CORRELATION AND REGRESSION ANALYSIS

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    yenne

    Cards (15)

    • Univariate Data - data involve a single variable.
    • Bivariate Data - data that involve two variable.
    • Correlation Analysis - is a procedure or process of describing the relationship between two variables.
    • Scatter Plot - is a graphical representation of the relationships between two variables.
    • The relationship between two variables is described in
      terms of strength and direction.
    • Positive Correlation
      A positive correlation exists if high
      values in one variable are associated
      with high values in another variable.
      Similarly, low values in one variable are
      associated with low values in one
      variable.
      If a positive correlation exists, then the
      points on the scatter plot closely follow a
      straight line slanting up to the right.
    • Positive Correlation
    • Negative Correlation
      A negative correlation exists if high
      values in one variable are associated
      with low values in another variable.
      Similarly, low values in one variable
      are associated with high values in
      one variable.
      If a negative correlation exists, then
      the points on the scatter plot closely
      follow a straight line slanting down
      to the right.
    • Negative Correlation
    • Zero Correlation
      A zero correlation exists when
      high values in one variable are
      associated to high or low values
      in the other variable.
      If a zero correlation exists, then
      the points on the scatter are
      randomly scattered. The points do
      not follow closely a straight line.
    • Zero Correlation
    • Types of Correlation According to Strength
      • Perfect Positive Correlation
      • High Positive Correlation
      • Low Positive Correlation
      • Perfect Negative Correlation
      • High Negative Correlation
      • Low Negative Correlation
    • Positive Correlation exists between two variables when the points on the scatter plot follow straight line slanting up to the right.
    • Negative Correlation exists between two variables when the two pints on the scatter plot follow straight line slanting down to the right.
    • Perfect Correlation exists between two variables when the two points on the scatter plot lie on a straight line.
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