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A study of a group of people who stay in that group over a long period of time. For example, all people born in 1960 are a cohort, as are all students who will graduate from high school in 1999. The study follows this group over time, rather than looking at them once.
The state of having more than one disease, diagnosis, or disorder at the same time; for example, the same person might have depression and panic attacks during the same period.
The measure of how well the test being studied and the "gold standard" test measure the same thing, at the same time.
A number range that shows how likely it is that the true amount is inside the listed range of amounts; for example, a 95% confidence interval of 25-45 would mean there is a 95% chance that the right amount (number, score, measurement) is somewhere between 25 and 45.
A way of sharing information by putting numbers into words so the information is easier to understand.
Something that makes something else change. For example, what you eat can make you have more red blood cells, and if red blood cells were being studied, the food you ate would be a determinant.
Developmental research is a variant of applied research in that the research has a problem solving function and leads to further research on the basis of its own findings.
The mechanisms by which the results of research are communicated to stakeholders and other interested parties.
Any questions or events which divert attention from what is being tested; usually items in a questionnaire to keep subjects from understanding what is being tested.
The measure of how often something (for example, an age or a hair color) is found in the group being studied; or the range of those measures.
Two different questions asked as if they were only one question; for example, “Did you take this medication and was it helpful?” which should be: “Did you take this medication?” (first question) and “Was it helpful?” (second question).
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