Hello Robert,
Glad you appreciate CODAP’s design. We really try hard to make it simple to use.
The functionality you need is, unfortunately and with a couple exceptions, not present in CODAP.
- In a scatterplot you can plot a least squares regression line and r-squared is reported along with the equation of the line.
- There are a set of statistical functions shown in the enclosed screenshot. A good example of using the correlation function is described here.
CODAP is constantly evolving through collaborations with other funded projects, which have been mostly science education projects. No project has yet had the aim of developing materials that fully support introductory statistics with a full complement of tests and estimates.
Plugins, like the Sampler used in the (new) Duck Pond example document, provide a fairly straightforward way to extend CODAP’s capabilities. You, or someone you know with a modicum of programming chops, could create a CODAP plugin that would do the computations you desire within CODAP. Alternatively, consider writing a proposal to the NSF or some other funding agency, and we’ll collaborate!
Bill