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Overview
Internal Validity
Internal Validity
External Validity
100
The criteria for evaluating research design
What is Internal and External Validity
100
extent research design controls or accounts for unwanted effects of extraneous variables
What is Internal Validity
100
extraneous evens that occur between observations that may confound results
What is History
100
extent results of study can be meaningfully applied beyond conditions of experiment
What is External Validity
200
1. how well does design account for extraneous variables that could limit interpretation of findings? 2. how dependable and representative is method for observing or measuring phenomenon? 3. how well does design allow findings to be applied to real world?
What is Three Questions to consider when evaluation research design
200
Internal Validity is threatened
When extraneous variable hide findings or serve as alternative explanations for findings...
200
practice, learning, or reactive effects as result of being exposed to same measures more than once
What is Testing
200
unique context of experiment that may limit generality of the findings
What is Contextual Characteristics (demand characteristics)
300
Relationship between internal and external validity
What is paradoxical. As one increases, the other decreases
300
history, maturation, testing, instrumentation, statistical regression, selection bias, attrition (mortality)
What are the common threats to internal validity
300
loss of subjects from study over time that confounds results
What is Attrition (mortality)
300
extent a subjects characteristics limit degree to which findings can be applied to real world
What is subject characteristics
400
External validity should have more weight in this scenario
What is when question is applied in nature
400
changes that occur within subjects over time that can confound results
What is Maturation
400
unintended changes in measurement criteria used by observers over course of study
What is Instrumentation
400
reactive effects of experimental arrangements, multiple treatment interference, novelty effects
What is 3 types of contextual characteristics
500
this type of study can eliminate all concerns about external validity of research findings
What is NO study
500
subjects included in study are at some extreme score on dependent measure, and when re-measured, their score moves toward an average/mean
What is Statistical Regression (regression bias)
500
systematic differences between groups based on selection or assignment of subjects to those groups
What is Selection Bias
500
any condition of assessment that is different from those that investigator wants to generalize to
What is Assessment Characteristics (test sensitization, reactivity of assessment)