Does anybody know how to show the R-squared for scattered polynomial trend line?

[Zhenyu Hu]

Dear All,

I am using google chart api to draw a scattered polynomial trend line.

I can get the trend line equation through the API, but I also want to know the R square which is used to measure the minimum distance of scattered points to the regression line.

Does anyone know how to show the R square?

Thanks a lot,

[Andrew Gallant]

The R-squared value is not available from the visualization API, you will have to calculate it yourself.

[Zhenyu Hu]

Hi Andrew,

Thanks for the feedback, I appreciate it!

Kevin

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[Sergey Grabkovsky]

Hi Zhenya, what Andrew said wasn't entirely correct. You can show the R square in the legend, but you have to make sure that you have enough space. Here is an example: http://jsfiddle.net/g7hz9ydL/

The option showR2 is what you're looking for.

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[Zhenyu Hu]

Hi Sergey,

Thanks a lot, it works!!!

There is a parameter "showR2: true" under trendlines options, but why this parameter doesn't show up on their documentation, how do yo find it?

Thanks,

Kevin

[Jon Orwant]

Documentation for showR2 will go live next week.

Jon

[Zhenyu Hu]

wow, that's great, thanks!

[Jon Orwant]

Coefficients of determination now documented at https://developers.google.com/chart/interactive/docs/gallery/trendlines#r2.

This works for all Google Charts that support trendlines: bar, column, scatter, and line.

Enjoy!

Jon

[Zhenyu Hu]

thanks a lot