Measures of selection

CODAP Forums CODAP Help Forum Measures of selection

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #1533 Score: 0
    Andee Rubin
    Participant

    We’d like to use the “measures of selection” feature – it seems like just what we need in our analyses – but it doesn’t seem to work the way we expect.  We have a graph of a single numerical distribution with the mean plotted.  We make another graph with a categorical variable (gender), select all the males and see those cases selected on the original distribution.  Then, when we choose “show measures of selection,” we expect to see the mean of the males.  Is this our problem or CODAP’s problem?

    #1536
    Bill Finzer
    Keymaster

    I’m so glad you ask. This feature came about as kind of special for the Zoom In Science project. It works just as you describe for a LSRL in a scatterplot. We never got around to extending it to other measures and I’ve felt very guilty about that.

    Now, with your prompting, I’ll move it up to the top of the list!

    Bill

    #1538
    Andee Rubin
    Participant

    Great – glad I asked, indeed!  This is great news.

     

    #5836
    Bill Finzer
    Keymaster

    Measures for Selection now works for all measures, not just the least squares regression line.

    Once enabled from the eyeball menu measures like the mean or median will respond to selection. So, for example, in the Mammals example document, if you are showing the mean of Lifespan on a plot, the mean will not show until you have some cases selected. Once you do, the mean showing will be the mean Lifespan of just those cases.

Viewing 4 posts - 1 through 4 (of 4 total)
  • You must be logged in to reply to this topic.