Posted: 11.05.06 08:49. Post subject: сколько бы ни было :

From: Steven Ruggles, ruggles.steven@gmail.com

Ken Wachter (1978) estimated that a given person in contemporary Britain
would have ancestors from about 85% of the people alive in 1066. But the
result depends on the assumptions, in particular how likely it is for a
given ancester to fulfill multiple ancestor roles. This in turn depends on
the extent of social and geographic endogamy as well as social and
geographic mobility. We have no good estimates of these things. Wachter
didn't provide much in the way of sensitivity tests, but I'll bet that a
plausible range of assumptions would yield a large range of results.

Wachter and Laslett wrote a piece in the same volume on patrliline
extinction, which is also relevant.

Wachter, K.W. 1978. Ancestors at the Norman Conquest. Pp 153-161 in
Wachter,
K. W., with E. A. Hammel, and P. Laslett. *Statistical Studies of
Historical
Social Structure*. New York, Academic Press.

Wachter, K.W., and P. Laslett. 1978. Measuring patriline extinction for
modeling social mobility in the past. Pp 113-135 in Wachter, K.W., with
E.A.
Hammel, and P. Laslett. *Statistical Studies of Historical Social
Structure*.
New York, Academic Press.