User talk:Youssef77323

February 2015
Hello, I'm Excirial. I wanted to let you know that I undid one of your recent contributions —the one you made with this edit to Cluster sampling— because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Excirial ( Contact me, Contribs ) 19:41, 11 February 2015 (UTC)