Estimating Design Effect and Calculating Sample Size for Respondent-Driven Sampling Studies of Injection Drug Users in the United States

Wejnert, Cyprian; Pham, Huong; Krishna, Nevin; Le, Binh; DiNenno, Elizabeth

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Estimating Design Effect and Calculating Sample Size for Respondent-Driven Sampling Studies of Injection Drug Users in the United States

May 2012
By Wejnert, Cyprian ; Pham, Huong ; Krishna, Nevin ; ...
Source: AIDS Behav. 16(4):797-806.

[PDF-564.42 KB]

English

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Details:

Alternative Title:

AIDS Behav
Personal Author:

Wejnert, Cyprian ; Pham, Huong ; Krishna, Nevin ; Le, Binh ; DiNenno, Elizabeth

Wejnert, Cyprian ; Pham, Huong ; Krishna, Nevin ; Le, Binh ; DiNenno, Elizabeth Less -
Description:

Respondent-driven sampling (RDS) has become increasingly popular for sampling hidden populations, including injecting drug users (IDU). However, RDS data are unique and require specialized analysis techniques, many of which remain underdeveloped. RDS sample size estimation requires knowing design effect (DE), which can only be calculated post hoc. Few studies have analyzed RDS DE using real world empirical data. We analyze estimated DE from 43 samples of IDU collected using a standardized protocol. We find the previous recommendation that sample size be at least doubled, consistent with DE = 2, underestimates true DE and recommend researchers use DE = 4 as an alternate estimate when calculating sample size. A formula for calculating sample size for RDS studies among IDU is presented. Researchers faced with limited resources may wish to accept slightly higher standard errors to keep sample size requirements low. Our results highlight dangers of ignoring sampling design in analysis.
Subjects:

[+]

Adolescent Adult Drug Users Epidemiologic Research Design Female HIV Seropositivity Humans Male Middle Aged Peer Group Referral And Consultation Risk-Taking Sample Size Sampling Studies Sentinel Surveillance Substance Abuse, Intravenous Young Adult
Source:

AIDS Behav. 16(4):797-806.
Document Type:

Journal Article
Place as Subject:

United States
Volume:

16
Issue:

4
Collection(s):

CDC Public Access
Main Document Checksum:

[+]

urn:sha256:a9825cd8780b822efe44ec01579da55b773ef114f432f019e6876baab626d053
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https://stacks.cdc.gov/view/cdc/10826/cdc_10826_DS1.pdf
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