highcharts-regression

Highcharts Regression
=====================

Linear and non-linear regression support for highcharts.
Allows you to add regression series to any existing series on your chart.
Calculates the r-squared value (coefficient of determination) and optionally prints it on the legend.
If Linear or Polynomial regression is selected, you can print the equation on the legend.

For a basic usage just add this property to the series json

regression: true

And for advanced configuration you can add options to

regressionSettings: {}

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##### type (String)
Regression type: 'linear' ,'exponential', 'polynomial', 'power', 'logarithmic', 'loess'. Default: linear

##### order (Int)
Set the order (polynomial only). Default: 2

##### name (String)
The name as it appears in the legend and tooltip. Use the following replacements:
* %r: Value of [correlation coefficient][wiki-r]
* %r2: Value of [coefficient of determination][wiki-r2]
* %eq: Regression equation
* %se: Standard error
Default: Equation: %eq

##### decimalPlaces (Int)
Set the number of decimal places for r and r² (linear only). Default: 2

##### lineType (String)
??. Default: spline

##### lineWidth (Int)
The width of the regression line. Default: 2

##### dashStyle (String)
Use one of Highcharts-recognized dash styles. Default: solid

##### color (String)
Use one of Highcharts-recognized color definitions. Default: none.

##### useAllSeries (Boolean)
??. Default: false

##### extrapolate (Int)
??. Default: 0

##### loessSmooth (Int)
??. Default: 25

##### visible (Boolean)
Whether to show the line itself. Hiding the line will grey out its legend item. Default: true

##### hideInLegend (Boolean)
The opposite of visible: show the line but not its legend item. Default: false

##### index (Int)
The index of the series in the chart, affecting the internal index in the chart.series array, the visible Z index as well as the order in the legend. Default: undefined

##### legendIndex (Int)
The sequential index of the series in the legend. Default: undefined

##### tooltip (Object)
Stardard Highcharts tooltip object

##### dataLabels (Array of objects)
Show dataLabels on specified points. Choose which points should have labels and enter their format. Supports Highchart dataLabel.format and the regression variables stated for name. Default: undefined

Format expected for dataLabel objects:
``
{
pointIndex: number // Index of the point to add label to.
format: string // The text/format for the label.
}
`

##### regressionSeriesOptions (Object)
Standard Highcharts series object.
Customize the options for the generated regression series. Default: undefined

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The plugin exposes properties to series[regressionSeries].options.regressionOutputs (Object)
* equation (Array[Int]) individual parts of the regression equation
* points (Array)
* rValue (Int) [correlation coefficient][wiki-r]
* rSquared (Int) [coefficient of determination][wiki-r2]
* standardError (Int)
* string` (String) the resulting formula in string format

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* Basic default settings: linear regression with equation in the legend
* Polynomial regression - with extrapolation and different style
* Linear regression
* Loess regression 50% smooth
* Linear regression with coeficient of determination
* Linear regression with coeficient of determination 2
* Download resgression data on different formats
* http://jsfiddle.net/3g4ryLc9/
* http://jsfiddle.net/3g4ryLc9/2/
* http://jsfiddle.net/3g4ryLc9/5/
* Drilldown support
* Regression enabled per series

[wiki-r]: https://en.wikipedia.org/wiki/Correlation_coefficient
[wiki-r2]: https://en.wikipedia.org/wiki/Coefficient_of_determination