title: How to compute similarities based on co-occurrence matrix?
body: <p>I have an item-item matrix (1877 x 1877). The values in the matrix represent the number of times two items occurred together. How can I determine the similarities between two items?
  Through reading, i found few options. However i am not sure about these approaches. Any inputs to get started is appreciated.</p>
  
  <ol>
  <li>Use cosine to compute sim between two vectors </li>
  <li>Turn this into a graph, use measures like simrank to compute similarity - may use the occurrence count as a weight between two nodes.</li>
  </ol>