Kvartiiliväleillä

Kvartiiliväleillä is a Finnish term that translates to "interquartile range" in English. It is a statistical measure used to describe the dispersion or spread of a dataset. The interquartile range is calculated by subtracting the first quartile (Q1) from the third quartile (Q3). Q1 represents the 25th percentile of the data, meaning 25% of the observations fall below this value. Q3 represents the 75th percentile, with 75% of the observations falling below it. Therefore, the interquartile range encompasses the middle 50% of the data.

The kvartiiliväleillä is considered a robust measure of spread because it is not affected by outliers, unlike the range (the difference between the maximum and minimum values). This makes it particularly useful for skewed distributions or datasets with extreme values. It provides a sense of how spread out the central portion of the data is. For example, if the kvartiiliväleillä of a set of test scores is small, it suggests that the majority of students scored very similarly. Conversely, a large kvartiiliväleillä indicates a wider variation in scores among the middle 50% of students. It is often used in conjunction with the median to provide a more complete picture of the data's distribution.