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Quintile It is a term that comes from the Latin word Quintīlis. According to the dictionary of the Royal Spanish Academy (RAE ), that's what the fifth month of the year at first roman calendar .

Said calendar was devised in the Ancient Rome as a system for the division of weather . It was used until the year 46 BC , when Julius Caesar ordered to modify it and thus arose the Julian calendar .

In this primitive Roman calendar, quintile was the fifth month. Over the years, the king Numa Pompilio incorporated two periods, turning quintile into the seventh month , being equivalent to July at calendar Gregorian .

The idea of ​​quintile, at present, usually appears in the field of economy . In this case, it is used to qualify the population sectors according to their income .

Thus, the population must be ordered from the poorest subject to the richest. Then you have to divide the population in question into five parts of the same number of members . This allows to obtain five quintiles , which are sorted according to income level. He first quintile represents the poorest people in the society , Meanwhile he fifth quintile It is equivalent to the wealthiest inhabitants.

Similarly, the notion of quintile is used in the statistics when the distribution is divided into five parts . Therefore, a quintile is equivalent to 20% of the total.

Quintile Finally, it was the name that the aborigines gave the Valley that is crossed by the Estero San Francisco (or Quilpué ) in the actual territory from Chile . There lived the picunches before the European conquest.

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