I don't have a data or graph unit per se. Several years ago, Math Their Way taught me to simply make it part of my weekly ritual. In other words, my goal is to make a graph a week. Honestly, I've had a hard time keeping that up throughout the years, but one of my goals this year is to do a better job of that. My graphs aren't fancy. They aren't cutesy. I just don't get much joy in spending a lot of my time preparing them. They are relevant though. They fit into whatever we're doing that week and go up on the wall as we make them. Here's a view of what we've accomplished so far.
When my wall space fills up, I replace older ones as newer ones are made. Then I keep them in a safe place so that at the end of the year they can go home as souvenirs. Graphing our year basically means that learning about and interpreting data from graphs seems like a piece of cake.