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 reaction times and hand-eye coordination in the Human
Systems Integration Laboratory. The variable of interest, ``anticipatory 
timing, '' was measured by a Bassin timer, which measures the ability 
to estimate the speed of a moving light and its arrival at a designated 
point. 

The Timer consists of a 10 foot row of lights which is controlled by a 
variable speed potentiometer. The lights are switched on sequentially 
from one end to the other so that light 'travels' at 5 miles per hour 
down the Timer. Each visitor was instructed to anticipate the 'arrival' 
of the light at one end of the Timer and at that time to swing a plastic 
bat across a light beam at the same end of the Timer. An automatic timing 
device measured the difference between the breaking of the beam and the 
actual arrival of the light. A negative value of a trial variable 
indicates the bat broke the beam before the light actually arrived. 

Each of 113 visitors completed the trial five times. Age and gender 
were also recorded. Visitors tended to come in family groups, but that 
information was not recorded.

It may be that subject # 35, who is a two year old with much slower
reaction times, should be deleted. 

These data were taken from the web site OzData at 

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

The file timetrial.dat contains the data with one column per trial and
one row per person. The file timetrial.repeated.dat contains the data
with one row per person per trial.