In this notebook, I'll show you how to make a simple query on Craigslist using some nifty python modules. You can take advantage of all the structure data that exists on webpages to collect interesting datasets.
Note - you can find the nbviewer of this post here
Coherence vs. Correlation - a simple simulation¶
A big question that I've always wrestled with is the difference between correlation and coherence. Intuitively, I think of these two things as very similar to one another. Correlation is a way to determine the extent to which two variables covary (normalized to be between -1 and 1). Coherence is similar, but instead assesses "similarity" by looking at the similarity for two variables in frequency space, rather than time space.