kvartiileihin

Kvartiileihin is Finnish, formed as the illative plural of the noun kvartiili, meaning quartile in statistics. A kvartiili is a value that divides a data set into four equal parts. In most practical use, three quartile cut points—Q1, Q2, and Q3—are employed. Q2 is the median; Q1 and Q3 are the 25th and 75th percentiles, respectively. The interquartile range (IQR) is the difference between Q3 and Q1 and measures the spread of the central 50 percent of observations.

The term kvartiileihin is used when data are grouped or analyzed by quartile categories, indicating movement into or assignment to those quartile groups. For example, phrases such as “tulokset on jaoteltu kvartiileihin” describe results that have been divided into quartiles. In Finnish statistical writing, kvartiileihin may accompany descriptions of distributions, summaries for each quartile, or analyses of trends across the quartile-based groups.

Related concepts include kvartiilit (the quartiles themselves), kvartiilirajat or kvartiilirajat (the quartile cut points), and kvartiilijakauma (a distribution described by quartiles). In practice, researchers may report Q1, Q2, and Q3 values, or describe data by kvartiileihin categorized groups to illustrate dispersion and central tendency.

See also: quartile, percentile, interquartile range, kvartiilit, kvartiilirajat.