Methods of CORRELATION and their formulae

 CORRELATION

To find correlation between two groups of numbers we use two types of methods

1) Scattered Diagram

2)Karl Pearson's method

3)Spearman's Rank correlation method.

4) Coefficient of Concurrent deviation.

The coefficient of correlation always lies between -1 and + 1

Coefficient of correlation is denoted by r.

If r=0 then there is no correlation between the two variables.

Types of correlation.

  • Simple correlation
  • Positive or direct correlation
  • Negative or inverse correlation.
  • Zero correlation
  • Multiple correlation
  • Perfect linear correlation.
  • Non-linear correlation
  • Partial correlation
  • Total correlation
  • Logical correlation 
  • Illogical correlation


#/ Karl Pearson's method formulae




















 #/ Spearman's Rank correlation method formulae.


















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