These data are used in the book "Computational Statistics" 
by G.H. Givens and J.A. Hoeting.

Name: memory.dat
Chapter: 11
Discussed in: Problem 11.4

Source: Table 11-1 on page 383 in F. Mosteller, R. E. K. Rourke and
G. B. Thomas (1970), Probability with Statistical Applications,
Addison-Wesley, 2nd edition.

Description: Average percentage memory retention was measured against
passing time, for times lapses from one minute to one week.

Variable labels: timeperiod, retention