Correlation
- 1. Rupam Paul Department :Textile Engineering Daffodil International University
- 3. Correlation: Correlation indicates whether there is any relation between the variables and the correlation coefficient measures the extent of relationship between them. Correlation Pearson’s correlation Ranking correlation
- 4. Pearson’s Correlation :The most common measure of correlation in stats is the pearson’s correlation .It’s full name is pearson product Moment correlation or PPMC . Ranking Correlation :A ranking correlation is any of several statistics that measure the relationship between ranking of different ordinal variable.
- 5. Pearson’s Correlation Formula : : Ranking Correlation Formula :
- 6. When r=0 There is no relation between x and y When r > 0 There is positive relation between x and y When r < 0 There is negative relation between x and y
- 7. Figure:1 explains there is no correlation between x and y. That is , they are independent. No Correlation Fig :1 Positive Correlation Fig:2 Figure:2 represents positive correlation between CGPA and Study time . That is , if Study time increases (decreases) CGPA will also increases(decreases).
- 8. Negative Correlation Fig:3 Figure :3 represents negative correlation between Supply and Price . That is, if supply increases(decreases) price will decreases(increases).
- 9. Questions : There any correlation between SSC and HSC GPA . SSC HSC 4.56 5.00 4.90 4.63 5.00 4.50 5.00 5.00 5.00 4.94 4.60 4.30 4.40 4.90 5.00 5.00 4.30 4.80 4.90 4.80
- 11. That is , there is negative weak correlation between HSC and SSC . Graph : -.6 -.4 0 .4 .6 1-1 Negative strong correlation Negative perfect correlation Negative weak correlation Positive weak correlation Positiv e averag e correla tion Positive strong correlation Positive perfect correlation Negative weak correlati on
- 12. THANK YOU