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Flashcards in experiments Deck (16):
1

experimental units

individuals that are studied; people, plants, things

2

subjects

when experimental units are people

3

outcome (response)

what is measured on each experimental unit

4

treatments

procedures applied to each experimental unit

5

randomized experiment

investigator assigns the treatment to the experimental units at random

6

double blind

neither investigators nor the subject know who has been assigned the treatment

7

completely randomized

no restriction which subjects may be assigned the treatment

8

randomized block

subjects are divided into blocks in such a way that the subjects in each block are the same or similar with regard to a variable that is related to the outcome

9

observational study

used when you can not randomly assign treatment
investigators DO NOT assign treatment

10

COHORT

group of subjects is studied to determine whether various factors of interest are associated with an outcome

11

prospective

subjects are followed over time

12

cross-sectional

measurements are taken at one point in time

13

retrospective

subjects are sampled after the outcome has happened

14

case-control

two samples are drawn

15

confounding

difficult to tell whether a difference in outcome is due to the treatment or some other difference between control and treatment

16

confounder

variable related to both the treatments and the outcome