title: How to simulate random returns with numpy
body: <p>What is a quick way to simulate random returns.  I'm aware of <code>numpy.random</code>.  However, that doesn't guide me towards how to model asset returns.</p>
  
  <p>I've tried:</p>
  
  <pre><code>import numpy as np
  
  r = np.random.rand(100)
  </code></pre>
  
  <p>But this doesn't feel accurate.  How are others dealing doing this?</p>