position measurements

position measurements

1. These are measures that account for a certain position within the distribution of certain data. with the purpose of summarizing in a single number the position or location of its distribution as well as how to characterize and represent them.

2. grouped data

   • quartiles
     • are measures that divide a data set into 4 equal parts. these are 3 values Q1, Q2 and Q3 called first, second and third quartile respectively.
   • quintiles
     • represent a position that divide a data set into 5 equal parts. grouping them into 20,40,60 and 80 percent which are represented by Q1,Q2,Q3,Q4 and Q5. Formula:
   • deciles
     • They are measures that divide a set into 10 equal parts. these are 9 values D1,D2....D8,D9 called first, second....eighth and ninth decile reactively.
   • Percentiles
     • A series of data is divided into 100 equal parts, the percentiles are 99 and go from P1, P2, P3 ...... P98, P99.

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