Interquartile Range (IQR) Calculator
Measure data spread by calculating the interquartile range (Q3 − Q1).
IQR: —
IQR represents the range of the middle 50% of the data.
Example
Dataset: 4, 7, 10, 15, 18
Q1 = 7
Q3 = 15
IQR = 15 − 7 = 8
What does this calculator do?
It calculates the interquartile range by subtracting the first quartile (Q1) from the third quartile (Q3).
Why calculate the IQR?
The IQR is commonly used to measure data variability and identify potential outliers in a dataset.
Frequently Asked Questions
Is IQR affected by outliers?
No. IQR is resistant to extreme values.
Can IQR be zero?
Yes. If Q1 and Q3 are equal, the IQR is zero.
Is this used in box plots?
Yes. IQR is a key component of box-and-whisker plots.