There's a big difference between a case study and statistics. A case study is just one big, detailed anecdote. You can learn from it to the degree that your s

There's a big difference between a case study and statistics. A case study is just one big, detailed anecdote. You can learn from it to the degree that your situation matches the situation described-- but you still don't know if the factors that you are matching on are actually the relevant factors or not in terms of the outcome. Statistics would be wonderful, if there were a way to normalize for all of the unknown factors. Which there isn't, so they aren't.