Shared Flashcard Set

Details

Internal & External Validity
Internal & External Validity
18
Health Care
Post-Graduate
09/15/2014

Additional Health Care Flashcards

 


 

Cards

Term
Internal Validity
Definition
a study's ability to ensure low extraneous variables impact on dependent variable

how to strengthen- control for threats to internal validity
Term
External Validity
Definition
the ability to generalize study results to other groups/settings

how to strengthen-control for threats to external validity
Term
History
Definition
threatens internal validity: events within pretest and posttest time lapse can effect dependent variable

how to control- have control group that doesn't gettx
Term
Maturation Effect
Definition
threatens internal validity- client natural changes between pretest and posttest time (wiser, older, change in physical.mental development)

how to control- include control group in study that doesn't get tx
Term
Testing
Definition
threatens internal validity-effects participant responses to post-test, due to familiarity with pretest

how to control- control group that doesn't receive same testing as experimental group (i.e, no pretest for control, but pretest for experimental)
Term
Instrumentation
Definition
threatens internal validity- poor use of equipment, different professionals using equipment, inaccurate procedures can alter outcome validity

how to control- try to use one trained professional or professionals with similar measures. Use same type of instrument and procedures throughout/with all groups
Term
Selection Bias
Definition
threatens internal validity- unaccounted differences between control and experimental groups that can alter outcomes/dependent variable

how to control- prior to tx, pretest groups in relation to dependent variable to account for any differences
Term
Selection Maturation Effect
Definition
threatens internal validity- use of intact groups at different maturation levels

how to control- pre-screen group maturity levels
Term
Statistical Regression
Definition
threatens internal validity- selection of participants based on very high or very low scores

how to control- randomization
Term
Mortality/Attrition
Definition
threatens internal validity-loss of participants over period of time

how to control- use meaningful incentives to encourage continued participation
Term
Hawthorne Effect
Definition
threatens internal validity- participant attitudes about being in a study/observation alter how they would normally behave

how to control- give similar special tx to control group w/o impacting dependent variable
Term
Placebo Effect
Definition
threatens internal validity- participant expectations impact behaviors instead of tx

how to control- provide both groups with same information to create similar expectations for study
Term
Diffusion of Treatment
Definition
threatens internal validity- tx of one group impacts/contaminates tx of other group

how to control- explain and request confidentiality of study measures to all participants, to prevent sharing of info
Term
Location
Definition
threatens internal validity- different location for interventions impact dependent variable

how to control- make locations same or as similar as possible.
Term
Implementation
Definition
threatens internal validity- individuals conducting/presenting experimental tx impacting dependent variable inadvertently (bias)

how to control- equal training and competency of all individuals responsible for implementation
Term
Selection Treatment Interaction
Definition
threatens external validity- ability to generalize results of study outside of group studied

how to control- randomization
Term
Setting Treatment Interaction
Definition
threatens external validity-environmental conditions of experimental group are unable or unlikely to be replicated in another setting

how to control-use similar/common settings, if feasible
Term
History Treatment Interaction
Definition
threatens external validity-when trying to generalize findings from different times that will impact dependent variable being studied

how to control- be aware of differences in day times, holidays, etc- conduct research study at similar times of day/night
Supporting users have an ad free experience!