Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: stacked histogram
Posted:
Mar 6, 2001 1:16 PM


At 9:46 AM 0600 03.6.2001, Woelber, Scott wrote: >I have a question from Tutorial 4: Polling Voters, from the Fathom Workshop >guide. The tutorial discusses sample size and demonstrates that the >variance of the sample decreases as the size of the sample increases. >Samples of size 100, 400, and 1000 are taken and the correpsonding sampling >distributions graphed. The last picture on page 25 is a single graph with >the sampling distributions (histograms) for the various sample sizes stacked >vertically. How was that graph produced? > >Thanks
Scott,
You defined a measure in the Sample of Voters called "ProportionOfYes." You also need to define a measure for the sample size. The formula is count( ). When you make your histogram for "ProportionOfYes," hold your shift key down and drag "sampleSize" to the yaxis. Shiftdragging will treat the sample size as a categorical variable. I hope this helps.
Ruth Carver
************************************** Ruth E. Carver Germantown Academy P.O. Box 287 Fort Washington, PA 19034
ruth@forum.swarthmore.edu http://forum.swarthmore.edu/ruth/math.html **************************************
To unsubscribe, send mail to majordomo@forum.swarthmore.edu In the body of the message, use the following command: unsubscribe fathom
To reach the (actual, human) owner of the list, send your message to: ownerfathom@forum.swarthmore.edu



