life table Flashcards
1
Q
life table
A
summarises birth and death rates for organisms at different stages of their lives
2
Q
Ix
A
proportion of cohort (group) surviving from age 0 to age x
3
Q
mx
A
average number of offspring from a female of age x (fecundity) - not calculated - measured
4
Q
nx
A
number censused at that age
5
Q
sx
A
age specific survival - value in ix columns - divide the one below by the one above
6
Q
fx
A
sx X mx
7
Q
R0
A
average number of offspring produced per individual (female)
8
Q
R0<1
A
population declines
9
Q
R0>1
A
population increases
10
Q
R0=1
A
stable population
11
Q
R0 (in relation to diseases) =
A
the number of people that one sick person will infect (on average)
