Dygraphs a JavaScript Visualization Library
Dygraphs is an open source JavaScript library that produces interactive, zoomable charts of time series.
It is designed to display dense data sets and enable users to explore and interpret them.
Features
Some of the features of dygraphs:
- Plots time series without using an external server or Flash
- Works in Internet Explorer (using excanvas)
- Lightweight (45kb) and responsive
- Displays values on mouseover (this makes it easily discoverable)
- Supports error bands around data series
- Interactive zoom
- Adjustable averaging period
- Can intelligently chart fractions
- Customizable click-through actions
- Compatible with the Google Visualization API
- Intelligent defaults make it easy to use
Dygraphs
Some things to notice:
- There’s less seasonal temperature variation in SF than in NY.
- The difference is about 15° F for SF vs. 50° F for NY.
- The daily data (set rolling period to 1) is quite noisy and hides this conclusion.
- Using a 14-day moving average makes it clearer. A 100-day rolling period averages out nearly all the specifics from the data.
- There’s a gap in the data for SF, when the weather station was down (zoom into October 2007 to see it).
- The bands around each point indicate average highs and lows.
- There is a lot of data in this chart: low, average and high for each city on each day of a three year period ≈ 6000 data points in all.
dygraphs allows the user to explore the data and discover these facts.
Requirements: JavaScript to be enabled
Info, Download and Demos page: http://www.danvk.org/dygraphs/
License: Free
