Each year the U.S. Naval Postgraduate School sets aside a
``Discovery Day'' during which the general public is invited into
their laboratories. Our data come from October 21 1995, when visitors
could test their motor learning and hand-eye coordination in the Human
Systems Integration Laboratory. The variable of interest, ``contact
time,'' comes from a rotary pursuit tracking experiment. A rotating
sheet contains a 3/4 inch target spot which moves.
The sheet is either in the shape of a circle or a
square. The subject is asked to maintain contact with the moving
target spot using a metal wand. Each trial lasted 15 seconds and the
total contact time was recorded. The target spot moves keeps a constant
speed in a circular path on the circle sheet, but moves at varying
speeds in an irregular path on the square sheet.

Each of 108 visitors completed the trial four times but for only one
of the two shapes. Age and gender were also recorded. Visitors
tended to come in family groups, but that information was not
recorded. 

These data were taken from the web site OzData at 

   http://www.maths.uq.edu.au/~gks/data/general/tracking.html

This web site no longer exists, but may have been absorbed by OzDASL, the
Australasian Data and Story Library at

   http://www.statsci.org/data/index.html