There were significant geographic challenges in locating and ascertaining data from the subjects in childhood.
A total of 251 newborns with Down syndrome and 396 electively aborted fetuses with Down syndrome were ascertained (data from Czech Congenital Anomalies Register); 61% of pregnancies with Down syndrome are electively aborted [ 22].
In genetic studies of rare complex diseases it is common to ascertain familial data from population based registries through all incident cases diagnosed during a pre-defined enrollment period.
Firstly, with the individual matching, it was possible to control primary confounders and to ascertain that data from cases and controls corresponded to each level of the confounders.
Nonfatal myocardial infarction was defined following the World Health Organization Multinational Monitoring of Trends and Determinants in Cardiovascular Disease criteria (23) and ascertained using data from five yearly medical examinations, hospital records of acute ECGs, and use of cardiac enzymes.
Our primary outcome of interest was ascertained through data from the local comprehensive provider of HIV clinical monitoring in a setting with no financial barriers to healthcare and we are unaware of any reason individuals might differentially report incarceration history based on their viral load status.
Resonance delocalization within the dipyridylamide scaffold is usually associated with shorter C-N amido -C bridges (e.g., about 1.34 Å eaC-N amido -CC-N amido -Cds (e.g., abridges38 Å), and a dihedral angle between the two pyridine ring planes approaching 0° as ascertained by data from several neutral dpa(H) and anionic dpa complexes[ 11, 13] (see the Supporting Information).g.
This ascertainment corrected version of the likelihood function is also useful in a Bayesian setting, for an example see Katzman et al. [14], where it was used in a Bayesian Hierarchical model for estimating distributions of selection coefficients from divergence ascertained data.
As can be noted visually, very accurate estimates of the unascertained allele frequency distribution are recovered from the divergence ascertained data.
