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The possibilities of selection are inexhaustive, thanks to generative programming.
When considering these results it is important to consider potential sources of error, particularly the possibilities of selection bias and confounding.
There are still some possibilities of selection bias due to questionnaire data in this study, since the confounder information was only available through CHC-questionnaires, which is likely to have lead to a selection towards high socio-economic status among those who answered the CHC-questionnaire.
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Since our study subjects were volunteers and thus self-selected, there is a strong possibility of selection bias.
There is a possibility of selection bias for which cases and controls were selected from the same hospitals.
First, the retrospective nature of the study introduces the possibility of selection bias.
Therefore, there is a possibility of selection bias in our study.
Minimization methods can improve balance but increase the possibility of selection bias.
At the end, the best member of each generation is presented to the user to create the possibility of selection of the best design among the elite.
Although the possibility of selection bias makes it difficult to draw causal conclusions from these observational studies, a number of investigations address that problem.
There was also a possibility of selection problem as has been pointed out in other CVM studies (Brox et al. 2003).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com