STATISTICAL POSITION MEASURES

STATISTICAL POSITION MEASURES

1. Position measures are responsible for dividing a data set into groups that have the same number of individuals. To calculate the position measures it is necessary that the data are ordered from smallest to largest.

2. Quartiles

   • Quartiles refer to the three values ​​of the variable that divide an ordered data set into four equal parts.
     • Q1, Q2 and Q3 determine the values ​​corresponding to 25%, 50% and 75% of the data. Q2 is equal to the median

3. Deciles

   • Deciles refer to the nine values ​​that divide a data series into ten equal parts.
     • The deciles give the values ​​corresponding to 10%, 20%. 30%.... and 90% of the data. D5 is equal to the median.

4. Percentiles

   • The percentiles are the 99 values ​​that divide the data series into 100 equal parts.
     • The percentiles give the values ​​corresponding to 1%, 2%... and 99% of the data. P50 is equal to the median.

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