title: Ways to calculate similarity
body: <p>I am doing a community website that requires me to calculate the similarity between any two users. Each user is described with the following attributes:</p>
  
  <p>age, skin type (oily, dry), hair type (long, short, medium), lifestyle (active outdoor lover, TV junky) and others.</p>
  
  <p>Can anyone tell me how to go about this problem or point me to some resources?</p>