Research Lec 3 Flashcards
(15 cards)
BMC Musculoskeletal Disorders Journal
Impact Factor
?
< 2 be concerned
Effect Size and, Power and Cohens D
Lec 2 brainscape
Why is it important to compare the randomized groups at baseline?
to compare differences between groups before and after treatments, see if there cofound variables
ex: comparing leg strength with two diff training programs but the groups before already have a big existing difference in leg strength
T-tests
compare means between groups
Change test (measure what)
average change of group 1 vs average change of group 2
calculating the change from before and after for each group and comparing THAT, not just the end result
Quasi-Experimental
no random assignment
typically involve the use of cohort groups
_______ is considered key for true experimental design
randomization
one group - more than one assessment per participant
one-way repeated measures (compares 1 group over 2+ time periods). the intervention can be given at any point or over a few days
Two or more groups - one assessment per participant
post-test only randomized group or post-test only non-randomized (intact groups)
two or more groups, one assessment per participant - factorial (2 +IVs) - fully independent
ex:
4 groups, each person only in one group - moderate ex at home, moderate ex at community center, intense ex at home, intense ex at center
each participant is given only one assessment
there is no control group
two or more groups - more than one assessment per participant: factorial (2 + IVs) - fully repeated
two IVs, 4 categories but now each participant gets to undergo each group/condition
one outcome measure per condition
each participant is their own control
two or more groups - more than one assessment per participant: factorial (2+ IVs) - mixed
groups of subjects moving through repeated conditions
2 groups (standard exercises, special exercises) each measured pre, post 1, post 2, etc
two or more groups - more than one assessment per participant: crossover
group 1 and group 2 both take pretest, one gets intervention the other doesnt, then post test. the cross them over, pretest, now the other group gets the intervention, post test 2
has a washout period between, to all effects from the first assessment to “washout”
what do single subject studies show?
