**The limit of sexual networks
data: **

Implications for mathematical modelling of STI

**We know**

**Slide 3**

**Slide 4**

**Slide 5**

**Slide 6**

**Slide 7**

**Detailed
micro-simulation/network models**

**Slide 9**

**Outline**

**Defining behavioural process**

**Simulation of Large Static
Multi-Component Networks**

900
simulated networks

**Between components**

**Size of largest component**

300
simulated networks

**Size of largest component**

600
simulated networks

**Size of largest component**

900
simulated networks

**Implications**

**Outline**

**Behavioural data**

**Individual based data**

**"Behaviour crudely
reported:"**

**"Sexual activity
distribution and mixing..."**

**Network data**

**Slide 24**

**Contact tracing data**

**Slide 26**

**Changes in sample
composition over time**

**Slide 28**

**Example:**

Estimation of
mixing pattern based on snowball sampling

**Slide 30**

**Centrality measures
estimates**

**Implications**

**Outline**

**Changes over time**

**Blower et al(1993)
**

Closed cohort of MSM in Amsterdam over 7 years

21% reduction in mean number of partners (m)

33% reduction in variance (v)

29% reduction in effective mean rate (c=m+ v/m)

**Slide 36**

**Slide 37**

**Slide 38**

**Slide 39**

**Slide 40**

**Implications (2)**

**Impact of AIDS mortality on
individual behaviour and network structure**

**Discussion**

Model limitations - Causes for concerns?

**Ackowledgments**

**End**