title: Caculating the percentage of respondents who answered yes to multiple questions
body: <p>I have survey result data in an excel sheet. The column headings are locations where respondents were willing to travel for work (11 total locations/columns) - they had to select yes or no for each location. What I want to know is what percentage of people who said yes to one were willing to travel to another, i.e., 20% of people who selected Chicago are also willing to go to Denver. There is no logical way to sort the responses, as they appear very random.</p>
  
  <p>People picked between 1 and 11 yeses. I'd like to run all the combinations.</p>