Hi, Thanks for sharing this. I'm a complete novice and was able to adapt your tutorial to suit some data I wanted to show for a student project. I'm having an issue getting a 'false' to work, (all my returns are 'true', even though they shouldn't be, and I have no red circles.) It seems like maybe the negatives in my data are being read as positives, not sure if I have missed something when bringing data in, or something is just wrong with my CSV? Any advice would be welcome.

Just looked at the notebooks on your profile. I think I found the one you were referring too. You may have flubbed a variable name. I submitted a suggestion with a fix.

Cool, thanks so much, I thought I had really checked it but clearly not.

No problem. Happy to help. We've all done that and sometimes you just need a second pair of eyes. Good luck on the assignment!

I just tested this code and the onClick text doesn't work with the current version of d3. Do you know what needs to be changed?