Hello, I can answer some of your questions even without access to a shared CODAP document.

1. Nope. No TinkerPlots mixup button. The case plot (the one with randomly scattered points) has a rescale button at the top of the inspector palette, but all it does is re-randomize the point positions.

3. You can stack histograms by dropping a categorical attribute on the¬†right axis.4. a. Unfortunately, you aren’t missing something.

4. b. Not possible currently as you know. Not likely to be a feature we add. Does the case card representation help you at all?

4. c. Have you tried “shift-click” and Cmd-click?

5. I think we chose to report r-squared because of its intuitive interpretation as the proportion of variability accounted for by the linear fit.

I notice that you attempted to upload a CODAP document, but apparently the forum won’t accept that. Try a shared-link instead.

Bill