Indices of central tendency: Quantiles

• Quantiles: Dividing the distribution of ordered
  values into equal-sized parts
  
  
  • Quartiles: 4 equal parts
  
  
  • Deciles: 10 equal parts
  
  
  • Percentiles: 100 equal parts
  
  
  
  

First 25% Second 25% Third 25% Fourth 25%

Q 1 Q 2 Q 3

Q 1 : first quartile

Q 2 : second quartile = median

Q 3 : third quartile