Add basic.range & statistical regression functions

[zikes]

basic.range based on underscore.js's range function, except that it will handle reverse ranges and is inclusive rather than exclusive.

For the statistic.exponentialRegression function I went with option 2 on Issue #32.

[zikes]

I'd like to implement Coefficient of Determination next, and while I'd definitely want to include it as a function in number.statistic, I'd also like to have it automatically calculated and returned as a result of regression functions. Since I'm returning a function object, I'm thinking of including it as a property of that function, so it would look something like this:

var regression_function = numbers.statistic.exponentialRegression(data);
console.log(regression_function.rSquared); // 0.9525786476263817

Thoughts/preferences?

[zikes]

I made a gist that uses the exponential regression function and d3.js, to illustrate: http://bl.ocks.org/4279121/b40e188b3faf7ed76e8662cee0631d51ba48157d

I had some difficulty creating a "build" of the updated numbers.js, and had to piece it together manually. Is there documentation on how to do this?

[sjkaliski]

@zikes that's such an awesome use case. I'll be merging this in, certainly. I use https://github.com/substack/node-browserify to "build" numbers.js. I need to include some tool to do that locally. That'll come shortly. Thanks so much!

[bengotow]

@Zikes This looks awesome! I'm actually refactoring a large Node.js project that does regression analysis to use Number.js, and this just made it 10x better suited for what I need. Thank you for contributing this stuff!

[thebyrd]

@Zikes Looks awesome!

[zikes]

Thanks! I'm hitting the limits of my maths knowledge so I don't know how much more I'll be able to contribute there, but I can certainly work on more d3 examples for the documentation. If there are any other numbers.js functions you'd like me to try to graph just let me know.