Leslie Matrices (VCE SSCE General Mathematics): Flashcards

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Leslie Matrices
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Purpose of Leslie matrices

Model population changes over time by age groups

Which gender is counted in Leslie matrix models?

Only females (they give birth to new members)

What is bib_i in a Leslie matrix?

Birth rate: avg. female offspring from age group ii

What is sis_i in a Leslie matrix?

Survival rate: proportion moving from group ii to i+1i+1

Range of values for survival rate sis_i

0si10 \leq s_i \leq 1

What's in the first row of a Leslie matrix?

Birth rates b1,b2,,bmb_1, b_2, \ldots, b_m

Where are survival rates in a Leslie matrix?

Entries just below the main diagonal

Recursive formula for Leslie matrix

Sn+1=LSnS_{n+1} = LS_n

Explicit formula for Leslie matrix after nn periods

Sn=LnS0S_n = L^nS_0

Four types of long-term population behaviour

Increase, decrease, stabilise, or oscillate

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