Sample Design and Estimation When Using a Web-Scraped List Frame and Capture-Recapture Methods

BACKGROUND Population size estimation of people who inject drugs (PWID) in Ho Chi Minh City (HCMC), Vietnam relied on the UNAIDS Estimation and Projection Package and reports from the city police department. The two estimates vary widely. OBJECTIVE To estimate the population size of people who inject drugs in Ho Chi Minh City, Vietnam METHODS Using Respondent-driven sampling (RDS), we implemented two-source capture-recapture method to estimate the population size of PWID in HCMC in 2017 in 7 out of 24 districts. The study included men or women aged at least 18 years who reported injecting illicit drugs in the last 90 days and who had lived in the city the past six months. We calculated two sets of size estimates, the first assumed that all participants in each survey round resided in the district where the survey was conducted, the second, used the district of residence as reported by the participant. District estimates were summed to obtain an aggregate estimate for the seven districts. To calculate the city total, we weighted the population size estimates for each district by the inverse of the stratum specific sampling probabilities. RESULTS The first estimate resulted in a population size of 19,155 (95% CI: 17,006–25,039). The second one generated a smaller population size estimate of 12,867 (95% CI: 11,312–17,393). CONCLUSIONS The two-survey capture-recapture exercise provided two disparate estimates of PWID in HCMC. For planning HIV prevention and care service needs among PWID in HCMC, both estimates may need to be taken into consideration together with size estimates from other sources.

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Prevalence of autistic spectrum disorders in Lothian, Scotland: an estimate using the "capture-recapture" technique

Archives of Disease in Childhood ◽

10.1136/adc.2004.049601 ◽

2005 ◽

Vol 91 (1) ◽

pp. 16-19 ◽

Cited By ~ 30

Author(s):

M J Harrison

Keyword(s):

Autistic Spectrum Disorders ◽

Autistic Spectrum ◽

Capture Recapture ◽

Spectrum Disorders

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Real-Time Tem Studies of Electromigration in Submicron Aluminum Runners

MRS Proceedings ◽

10.1557/proc-391-249 ◽

1995 ◽

Vol 391 ◽

Cited By ~ 17

Author(s):

S. P. Riege ◽

A. W. Hunt ◽

J. A. Prybyla

Keyword(s):

Real Time ◽

Joule Heating ◽

Current Density ◽

Constant Voltage ◽

Sample Design ◽

A Current

AbstractDirect real-time observations of electromigration (EM) in submicron Al interconnects were made using a special sample-stage which allowed TEM observations to be recorded while simultaneously heating and passing current through the sample. The samples consisted of 4000 Å thick Al(0.5wt%Cu) patterned over a TEM-transparent window into five runners in parallel, with linewidths 0.2, 0.3, 0.5, 0.8, and 1.0 μm. Both passivated and unpassivated samples were examined. A current density of 2 x 106A/cm2 was used with temperatures ranging from 200 - 350°C. The experiments were done using constant voltage testing, and we used a special sample design which dramatically minimized Joule-heating. Our approach has allowed us to directly observe voids form, grow, migrate, pin, fail a runner, and heal, all with respect to the detailed local microstructure of the runners.

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Minimax-regret sample design in anticipation of missing data, with application to panel data

Journal of Econometrics ◽

10.1016/j.jeconom.2020.12.006 ◽

2021 ◽

Author(s):

Jeff Dominitz ◽

Charles F. Manski

Keyword(s):

Missing Data ◽

Panel Data ◽

Minimax Regret ◽

Sample Design

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Multiple sclerosis prevalence in Malaga, Southern Spain estimated by the capture–recapture method

Multiple Sclerosis Journal ◽

10.1177/1352458511421917 ◽

2011 ◽

Vol 18 (3) ◽

pp. 372-376 ◽

Cited By ~ 32

Author(s):

O Fernández ◽

V Fernández ◽

M Guerrero ◽

A León ◽

JC López-Madrona ◽

...

Keyword(s):

Multiple Sclerosis ◽

Prevalence Rate ◽

Latitudinal Gradient ◽

Southern Spain ◽

Median Frequency ◽

Mediterranean Countries ◽

Current Prevalence ◽

Capture Recapture ◽

High Figure ◽

Southern European Countries

Background: Although not definitively proven, there is commonly accepted to be a latitudinal gradient in the distribution of multiple sclerosis (MS), which is more frequent in temperate zones. The European Mediterranean countries are situated in a zone of median frequency, although ever increasing figures have been noted in the last decades. Objective: The objective of this study was to assess the current prevalence rate of MS in the province of Malaga, Southern Spain. Methods: The capture–recapture method (CRM) uses independent sources of data and permits the number of non-registered cases of a given disease to be estimated, and by doing so, to avoid ascertainment bias. Results: Use of this method showed the estimated prevalence rate of MS in the province of Malaga, Southern Spain, to be 125/105 (95% confidence interval: 102/105–169/105), higher than the figures published previously. Conclusions: Although we recognize that these data need to be confirmed in further studies and in other areas of the country using a similar method, we believe this study is the first to find such high figure of prevalence, being very similar to the figures reported in recent years in other southern European countries.

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