DS StatisticsLesson 13Free preview

Stat Percentiles

This lesson is part of Data Science · All levels

Summary

The percentage indicates the position of a value relative to the entire data: the N-percent means that N percent of the data is below that value. Quartiles are the four parts of the data, where Q2 is equal to the median. The interquartile distance (IQR = Q3 - Q1) measures the distribution of 50% of the central data and is used to detect outliers.

Key points

N percentile: N percent of the data is below that value.
Q1 is 25th percentile, Q2 is median, Q3 is 75th percentile.
Q3 divides 75% of the data below and 25% above.
IQR = Q3 - Q1, the basis of outlier determination (1.5 IQR).
The boxplot visualizes the distribution based on the quartile.

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