A colleague is a devotee of confidence intervals. To him, the CI have the magical property that they are immune to the multiple comparison problem– in other words, he feels its OK to look at a bunch of 95% CI and focus on the ones that appear to exc…
Tag: symbol statement
Example 9.23: Demonstrating proportional hazards
A colleague recently asked after a slide suitable for explaining proportional hazards. In particular, she was concerned that her audience not focus on the time to event or probability of the event. An initial thought was to display the cumulative haz…
Example 9.22: shading plots and inequalities
A colleague teaching college algebra wrote in the R-sig-teaching list asking for assistance in plotting the solutions to the inequality x^2 – 3 > 0. This type of display is handy in providing a graphical solution to accompany an analytic one. RThe plot…
Example 9.21: The birthday "problem" re-examined
The so-called birthday paradox or birthday problem is simply the counter-intutitive discovery that the probability of (at least) two people in a group sharing a birthday goes up surprisingly fast as the group size increases. If the group is only 23 peo…