title: Extracting specific countries in Panel Data
body: <p>I have a panel data consisting of 180 countries in a .csv file, and I would like to create a subset of the 180 countries to run regressions based on the subset.</p>
  
  <p>Here is a screenshot of my dataset: <img src="https://i.stack.imgur.com/hZJEk.png" alt="http://i.imgur.com/e3s3XVn.png"></p>
  
  <p>I have been toying with the subset function but I can't seem to get it to work correctly.</p>
  
  <p>Ultimately, how should I go about creating a subset that just includes, for example, "Albania", "United States" while keeping other columns the same.</p>
  
  <p>Thank you for any suggestions.</p>