POSITION MEASURES

POSITION MEASURES

1. ¿What is it?

   • Statistical indicators
     • They allow you to summarize the data into one or divide its distribution into intervals of the same size.

2. Importance

   • It is the main and basic knowledge in statistics.
     • They help group them together and even codify them.

3. Non-central position measures

   • Quartile
     • Divide the distribution into four equal parts.
       • Q1: The lower values of the distribution are below the first (25%).
       • Q2: Half or median are the lower values equal to quartile two (50%)
       • Q3: The superiors are represented by the quartile three (75%).
   • Quintile
     • Divide the distribution into five parts.
       • It is represented by the letter K together with the sub-index of the quintile: K1: 20% - K2: 40% - K3: 60% - K4: 80%
   • Decile
     • Divide the data into ten equal parts. There are nine deciles, from D1 to D9.
       • The D5 corresponds to the median.
   • Percentile
     • Divide the distribution into 100 parts. There are 99 percentiles.
       • These are represented by the letter P and the sub-index (P10).

4. Central position measures

   • Average
     • It’s the average of all the data in the sample.
   • Median
     • It is the mean value of all data sorted from lowest to highest.
   • Mode
     • It is the most repeated value of the dataset.

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