Petra;

How's this?

Here's a quiz for you; which set of windows is better, A or B?

In each case, a "." marks a day without quakes, a"*" is a quake
and the "^^^^^" is a prediction window. There are 60 days in the
time period and 60 quakes total. Each set has 5 predictions for
"a quake in the 5 day window".

Set A
                                   *
                                   *                  *
                        *          *                  **
          *             *     *    *      *           **
*    *    *        *    *     *    *      *     *     **   *
*.*..*.*.**.***..*.**.*.**.*********.*....*..*..***...**.*.*
^^^^^      ^^^^^         ^^^^^      ^^^^^        ^^^^^
Set A has 13 of 60 quakes in its' windows.

Set B
                                   *
                                   *                  *
                        *          *                  **
          *             *     *    *      *           **
*    *    *        *    *     *    *      *     *     **   *
*.*..*.*.**.***..*.**.*.**.*********.*....*..*..***...**.*.*
         ^^^^^         ^^^^^      ^^^^^  ^^^^^        ^^^^^
Set B has 34 of 60 quakes in its' windows.

Roger