What does IQR stand for in statistical analysis?

IQR stands for Interquartile Range, which is a measure of statistical dispersion. It is calculated as the difference between the 75th percentile (Q3) and the 25th percentile (Q1) of a dataset. This range effectively captures the middle 50% of the data, providing insight into the spread of the central portion of the dataset while also being less affected by outliers and extreme values than the overall range.

By focusing on the interquartile range, analysts can better understand the variability and distribution of the data, making it a fundamental concept in descriptive statistics. The use of percentiles helps to illustrate how the data is distributed and highlights areas where there is density of values. Therefore, defining IQR as Interquartile Range is accurate and aligns with its common usage in statistical analysis.

The other options, such as Interquadratic Range, Inverse Quartile Range, and Interquartile Ratio, do not accurately describe the concept and terminology used in statistical analysis. These terms are not recognized in the field, making "Interquartile Range" the correct and widely accepted definition of IQR.