1. Network Scale-up method
علی اکبر حقدوست، اپیدمیولوژیست

2. Objectives To understand the basic concept of the NSU method
12 Oct. 2009
Objectives
To understand the basic concept of the NSU method
To know what type of information you need
To list its advantages, disadvantages, assumptions and limitations
To compute the size of a hard to count population with such methods
Multiplier

3. t C

4. The main concept of NSU
Social network size (C): the mean number of people known to any member of the general population
m: on average, each member of our sample knows m people from E
e: the size of sub-population E that we would like to estimate its size
t: the total size of population

5. Estimation of the network size
Scaling from known populations: twins, with aged more than 65
Direct method: by asking respondents to tell us how many people they know

6. Main methodological consideration
Transparency
Prestige bias
Rounding effect
Zero inflated distribution
Skewed distribution