IQR Upper and Lower Fence Calculator
IQR upper and lower fences are crucial in statistical analysis, helping to identify outliers and understand data distribution. Our calculator simplifies this process.
- Enter the first quartile (Q1) and third quartile (Q3) values.
- Choose a multiplier (default is 1.5).
- Click ‘Calculate’.
The formula for IQR upper fence is Q3 + (multiplier * IQR), and for lower fence, it’s Q1 – (multiplier * IQR). IQR is calculated as Q3 – Q1.
| Multiplier | IQR Upper Fence | IQR Lower Fence |
|---|---|---|
| 1.5 | 75 | 25 |
| 2 | 80 | 20 |
- Use a multiplier of 1.5 for most cases.
- Adjust the multiplier for more or less stringent outlier detection.
What are quartiles?
Quartiles divide a data set into four equal parts.
What are outliers?
Outliers are data points that differ significantly from other observations.
BLS Guide to Statistics | NPR: What is an Outlier?