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# source: http://multithreaded.stitchfix.com/blog/2016/01/13/market-watch/
# https://github.com/klarsen1/MarketMatching

# from terminal command line:
    sudo apt-get install libcurl4-openssl-dev

# from R command line:
# install CausalImpact package:

    install.packages("devtools")

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import scrapy

class StackOverflowSpider(scrapy.Spider):
	name = 'stackoverflow'
	start_urls = ['http://stackoverflow.com/questions?sort=votes']

	def parse(self, response):

		for href in response.css('.question-summary h3 a::attr(href)'):

bjpcjp

1) Make a download dir to store the node source and download it.

    mkdir downloads
    cd downloads
    git clone https://github.com/joyent/node.git
    Find the latest version

2) List all of the tags in the repository, and check out the most recent.
    git tag
    git checkout v0.9.9

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denominator = @xs.reduce(0) do |sum, x|
  sum + ((x - x_mean) ** 2)
end