Exact(1)
First, we minimise the confounding effect of family disruption and single motherhood which are inevitably linked to stepfather presence by selecting a subsample of ALSPAC families who have experienced relatively stable household structures.
Similar(7)
Selecting a subsample of industries is consistent with the methodology used in the World Bank Enterprise Surveys [ 18].
We repeated the logistic regression and power analysis by selecting a 60% random subsample of the controls that results into similar sample size as that of the cases (results not presented), which yielded very similar results, qualitatively and quantitatively.
To increase power to find families with linkage to BPD we screened 637 BP-pedigrees, provided by the NIMH Bipolar Genetic Initiative, and selected a subsample presumed to carry a genetic form of BPD.
Here we selected a subsample of operated patients, as it was the main selection criterion in the development sample.
Identity by descent (IBD) was computed using PLINK (http://pngu.mgh.harvard.edu/∼purcell/plink/) in order to (1) identify (latent) relatedness among subjects (2) identify duplicates and (3) select a subsample of unrelated individuals.
From these 2,298 samples, for cost-efficiency reasons we selected a subsample for genetic analyses, using a case cohort design.
The general approach taken in this paper was to use exact matching methodology to select a subsample of homogeneous records.
Related(1)
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Justyna Jupowicz-Kozak
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