The Limitations of Family Reconstitution

2. Selection Bias
Wrigley’s proof that reconstitution population was representative
No comparison of the infant and child mortality
between migrants and non-migrants was given, but
there is a table that compares birth intervals of the
two groups
Mean intervals between successive births:
Wrigley’s proof that reconstitution population was representative
35
34
Non-migrants
Migrants
33
Mean Intervals (months)
32
31
30
29
28
1550-99 1600-24 1625-49 1650-74 1675-99 1700-24 1725-49 1750-74 1775-99 1800-37
Period
24