Week 2 Flashcards
extraneous variables
effect of factors outside/not measured in the study on results
guess: effect of factors outside/not measured in the study on results
extraneous variables
maturation
changes in the participants due to their psychological or physical development that cannot be disentangled from the experimental manipulation
repeated testing
repeated testing can create familiarity and/or memory effects
instrumentation
in longitudinal studies, changes in the definition of constructs and in their measurement can make the interpretation of changes in participants responses much more difficult, if not impossible
statistical regression
extreme scores on measures, both high and low, tend to be less extreme upon retesting; changes may not be due to experimental manipulation
selection biases
impact of exclusion criteria on generalizability or assigning participants to experimental conditions may have on the outcome of the study
attrition
the loss of participants over time/ systematic differences in those that stay
vs. those who drop out from the study/ no longer a representative sample
sample characteristics
can be limited by the extent to which the particular sample
map onto other samples and populations (e.g. sociodemographic and
psychological characteristics
case studies are good for…
generating hypothesis for further research and studies
what is a weakness of case studies?
most threats to internal validity cant be addressed
what is the most commonly used research design in clinical psychology?
correlational studies
in correlational studies, only _____ of variables is looked at
association of variables
correlational studies are used for…
incidence, prevalence and distribution
ex. how common is depression?
Structural equation modeling (SEM) tests
complex hypothesis; large samples
One major weakness of the quasi-experimental design is that
there is no random assignment of participants to experimental
conditions
which research design uses random assignment?
experimental design or randomized controlled trial (RCT) uses random assignment to control and treatment condition
which research study is • Good against threats to internal validity; poor external validity (generalizability)
Experimental design or randomized controlled trial (RCT)
Internal consistency
degree to which elements of a test are homogeneous
Face validity
the extent to which is appears to be measuring phenomenon
Content validity
fully and accurately assesses what it is meant to assess
Criterion validity
ability to differentiate accurately between groups
Concurrent validity
triangulation with other measures at the same time.
Do the different ways of measuring agree with each other?
classification validity
does the classification scheme capture the nature of the entity?