Network Scale-up method

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Presentation transcript:

Network Scale-up method علی اکبر حقدوست، اپیدمیولوژیست

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 www.hivhub.ir Multiplier

t C www.hivhub.ir

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 www.hivhub.ir

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 www.hivhub.ir

Main methodological consideration Transparency Prestige bias Rounding effect Zero inflated distribution Skewed distribution www.hivhub.ir