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Presentation1

  1. 1. CORRELATION
  2. 2. Definition • Tendency of two or more groups or series of items to vary together directly or inversely. • Analysis of association b/n two variables. • Eg; price & supply
  3. 3. Different kinds of correlation • Positive & negative • Linear & non – linear • Simple , multiple & partial
  4. 4. Positive & negative • +ve - value of two variables moves in same direction. • Eg; price& supply • -ve- value of two variables moves in opposite direction. • Eg; price& demand
  5. 5. Positive correlation
  6. 6. Negative correlation
  7. 7. Linear and non- linear • Linear –const ratio of change exist b/n two variables. • Eg ; X : 20 25 30 35 40 y : 30 37.5 45 52.5 60 ratio 2:3. Non-linear-no const ratio
  8. 8. Simple, partial & multiple • Simple – only two variables • Multiple-degree of association b/n one variable to others. • Eg ;yield with both rainfall & temperature. • Partial –relating 2 variables assuming one as const. • Eg –yield & rain fall (temperature const).
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