title: Google analytics filtering data
body: <p>I'm reasonably new to google analytics. The site I am trying to analyse though is very big and has a lot of dynamic content.</p>
  
  <p>To try and make my job easier I've made a filter to mash all the times users viewed their own profiles into one number rather than counting each one seperately. The trouble is...I can't check if I've done this filter right as it is working as a new copy of the analytics for my 
  page, it didn't take the old data with it and I will have to wait until tomorrow for it to fill with a days's worth of data.</p>
  
  <p>What I wonder is, is the anyway to make filters that take pre-existing data with them and merely change it? Or are filters doomed purely to filter incoming
  data and what has gone before is untouchable?</p>