Outlier Detective
Upload a CSV, or try the sample: see a column's spread on a number line, and inspect what's flagged.
Your file is processed entirely in your browser. It is never uploaded anywhere.
What is happening?
Every dot is a value in the selected column, placed left-to-right by size. The two faint vertical lines are the IQR fences: 1.5× the interquartile range beyond the 25th and 75th percentile. Anything past a fence is colored as an outlier; click a red dot to see exactly how far it sits beyond the fence.
Under the Hood
CSV parsed in-browser↓Quartiles + IQR fences computed for the column↓Values plotted; anything past a fence marked as an outlier
Inputs
- Any CSV with a header row
Processing
- Quartile calculation
- IQR outlier rule (1.5× IQR)
Output
- Number-line plot
- Outlier list with distance beyond fence
Technology
- Vanilla JavaScript, FileReader API
Explore another experiment
More Playground experiments are on the way.