correl analysis

• UNIVARIATE DATA

  ➢ Measures only one variable

  ➢ Find a central value using mean, median and

  mode

  ➢ Find how spread out it is using range, quartiles

  and standard deviation

  ➢ Make plots like Bar Graphs, Pie Charts and

  Histograms
• BIVARIATE DATA

  ➢ Measure only two variables
• BIVARIATE ANALYSIS

  ➢ Analysis of bivariate data

  ➢ Relationship between two sets of values
• 3 TYPES OF BIVARIATE ANALYSIS
• SCATTER PLOT

  ➢ Scatter plot (aka scatter chart, scatter graph)

  ➢ Uses dots to represent values for two different

  ➢ Positive linear, negative linear, curvilinear, or no

  relationship

  ➢ Independent variable: can be controlled or

  manipulated

  ➢ Dependent variable: cannot be controlled or

  manipulated
• types of scatter plot

  A) stong positive correlation

  B) moderate positive correlation

  C) no correlation

  D) moderate negative correlation

  E) strong negative correlation

  F) curvilinear relationship

  
• CORRELATION COEFFICIENT

  ➢ Expresses the extent to which two variables are

  linearly related (meaning they change together

  at a constant rate)

  ➢ Relationships without making a statement

  about cause and effect

  ➢ Pearson Correlation Coefficient: degree of

  linear association/relationship between two

  variables (at least of interval scale)

  • Measured by correlation coefficient,

  denoted by r
• REGRESSION ANALYSIS

  ➢ Statistical method that establishes the

  relationship

  ➢ Two continuous (quantitative) variables

  ➢ Independent Variable

  Also known as predictor or explanatory

  ➢ Dependent Variable

  • Outcome or predictable variable