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13 Cards in this Set

  • Front
  • Back

Observational Study

observes and measures specific characteristics, but doesn't attempt to modify the subjects being studied



Designed Experiment

intentionally changes the value of an explanatory variable, and then records the value of the response variable for each group.

Explanatory Variable

The variable that will be measure in an experiment.

Explanatory Variable

A variable that is being manipulated by the researcher in order to see if it affects the response variable.

Confounding

the effect of two or more explanatory variables are not separated. is not able to distinguish between the effects of different factors

Lurking Variables

explanatory variable that was not considered in a study but affects its.

Cross-Sectional Studies

study in which data are observed, measured, and collected at one point in time

Case Control Studies

these are retrospective, individuals who have a certain characteristic may be matched with those who don't

Retrospective

study in which data are collected from the past by going back in time

Cohort Studies

identifies a group of individuals to participate in the study (the cohort) The cohort is the observed over a long period of time. During this period, characteristics about the individuals are recorded and some individuals will be exposed to certain factors and others will not. At the end of the study the value of the response variable is recorded for the individuals.

Prospective

study in which data are collected in the future from groups sharing common factors

Census

a list of all individual with certain charateristic.

Experiment

applies some treatment and then proceeds to observe its effects on the subjects