Challenges arising from selective enrollment are broadly recognized, although the potential for this selection to compromise both generalizability and internal validity is sometimes disregarded.
Second, people getting a positive count are not a randomly selected group and the model thus needs to account for this selection effect as well.
Neymar is just too old for this selection, having turned 23 in February.
A good experiment controls for this selection bias and tests only the effects of the school.
Arsenal paid a price of sorts for this selection, playing the first half-hour with precious little spark or wit.
That is not the only day of the week the artist paints, but the qualification gave him the rubric for this selection.
Mr. Ligeti, who played with four color-coded mallets for this selection, created ambient layers of shimmering and increasingly intense sound.
Once there, nestle down for this selection of great comedy moments in climate change with a nice brew of organic fairly traded coffee made using a carbon neutral machine (served in a reusable cup from low energy intensity materials).
Multi-objective optimization methods may provide solution for this selection.
Further studies are needed to evaluate the benefits of intensive care for this selection of patients.
Therefore, the Heckman two-step maximum likelihood procedure was used to correct for this selection bias.
