Quick start
- Paste grouped classes or raw scores, then adjust width/start.
- Unequal widths? The histogram switches to frequency density so bar area still equals frequency.
- Copy a shareable URL or export CSV/SVG for handouts.
All parsing and plotting stay in your browser. No uploads.
Inputs & settings
| Lower bound L | Upper bound U | Frequency f |
|---|
Results
Graphs
Histogram
Cumulative frequency (ogive)
Summary
Bar area tracks frequency, and ogive points sit on each upper boundary.
Steps & reasoning
Share & export
FAQ
Should histogram height use frequency or frequency density?
If all widths match, frequency works because bar area tracks count. When widths differ, use frequency density so each bar area equals its frequency.
Where do ogive points go?
At each upper boundary with the cumulative frequency there, matching classes defined as [L, U).
What do relative and cumulative relative frequency mean?
Relative frequency is f/N; cumulative relative is the running total. The final value is always 1 (100%).
Why highlight modal or median classes?
They show where the distribution peaks and where half the observations accumulate. With unequal widths, the modal class uses the highest frequency density.
Is any data uploaded?
No. Everything runs locally, and the share URL only stores parameters in the query string.
How to use Statistics Frequency Pack effectively
What this page is for
Use this page to summarize grouped or frequency data with mean, spread, and distribution clues. Start with clean value-frequency pairs and verify totals before reading statistics.
Input checks
Confirm whether each row is a single value, midpoint, class interval, or category. Mixing grouped and ungrouped assumptions changes the interpretation.
Workflow
A useful sequence is to check total frequency, inspect center and spread, then compare percentiles or distribution shape only after the table is clean.
Common mistakes
Avoid hiding outliers or empty classes without noting the change. Frequency tables can make data look smoother than the underlying observations.
How to read the result
Interpret summary values with the table shape. A mean or standard deviation is most useful when you also know where the mass of the frequency distribution sits.