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Other limitations were the use of a convenience sample and selection bias.
A description of the sampling methods for the original cross-sectional sample and selection of the longitudinal sample have been described previously (Tomblin et al. 1997, 2000).
8 That study, however, examined a only fraction (20%) of admissions in Massachusetts that occurred in only a subset of Massachusetts hospitals (48/70), potentially leading to both non-representativeness of the study sample and selection bias if insurance obtained under the reform led to a change in hospitals to which patients were admitted.
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One shortcoming of a sentinel surveillance program is the potential for sampling and selection bias.
Details of sampling and selection have been presented previously [ 14].
Sampling and selection of respondents varied by site and client load.
Selection bias in this study was minimized by random sampling and selection bias due to non-participation was considered negligible.
The Lausanne branch of the Ludwig Institute for Cancer Research (LICR-LB) performed extensive pre-testing of donor samples and selection of appropriate donors.
We recognize that there is a wide range of diagnostic quality of source material; our statistical sampling and selection methods were designed to eliminate or minimize selection bias.
Thus, the sampling scheme, sample size, and selection of diagnostic tests may change with decreasing prevalence.
However, the comparability of the country-specific sample designs and selection procedures in PIAAC is limited.
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