Exam 2 Flashcards
Theory (definition)
A proposition about what explains the outcome of interest; makes (a set of) generalization(s) that seek(s) to explain real-world phenomena
Theory (definition’s implications)
Implies hypotheses with observable implications (sets unit of analysis- states, regimes, institutions, parties, individuals, etc.)
How do we evaluate theories?
We evaluate theories by examining if they can account for what we observe in the real world (we can dismiss theories that do not hold and get closer to the systematic knowledge through a continuous process of elimination)
Are theories “right”?
Theories are never right, see building theory
Building theory
The process of continuous scrutiny, re-evaluation, and adaptation (NOTE: some theories widely are almost universally accepted)
Theories must be…
Falsifiable (capable of being proven wrong); ex of a non-falsifiable theory: extra-terrestrials hide among us and periodically save the planet (usually on Christmas)
Research design
Use empirical analysis to evaluate theories and their observable implications (systematic analysis of data, does not make value judgements i.e. normative)
Research design objective
To find cause-and-effect relationships between two or more variables (change in one variable causes change in another variable in a predictable way)
Variable
Any factor, trait, or condition that can exist in differing amounts or types
Variable examples (what explains vote choice?)
Education, race, religiosity, income, ideology, etc.
Dependent variable (DV)
What we are interested in explaining i.e. the object of our study, the variable we expect to be affected by other variable(s), the variable whose value changes as a result of change(s) in the value(s) of other variable(s)
Dependent variable example (voting)
Vote choice
Independent variable (IV)
The factor that influences or causes the dependent variable to vary; ex: A causes B (A=IV, B=DV)
Independent variable voting example
Education, race, religiosity, income, ideology
When only one IV
Univariate analysis
Two IVs
Multivariate analysis
Hypothesis
An observable implication of a theory that can be tested empirically; posits a testable cause-and-effect relationship between IVs and DVs; “if our model/theory is correct, then we should observe in the real world that _______”;
Most important thing about hypotheses
They are testable
Steps in hypothesis testing
1) Defining key terms, 2) specifying hypotheses, 3) identifying variables, 4) collecting and examining evidence (we are looking for evidence that would support and contradict our hypothesis), 5) drawing conclusions (evidence may be a. consistent with hypothesis, b. inconsistent with hypothesis, c. inconclusive)
Correlation
Change in value of IV associated with change in the value of the DV
Positive correlation
IV and DV vary in the same direction (IV increases, DV increases)
Negative correlation
IV and DV vary in the opposite direction (IV value increases, DV value decreases)
Correlation vs. causation
Correlations are necessary to establish a casual effect, but correlation is not explanation (it does not tell us why variables are correlated); correlation is not causation
“Controlling”
Accounting for alternative explanations, ensuring that we only compare “like to like” (and not apples to oranges); ex: testing children’s “general knowledge” finding a positive correlation between height and what children know –> tall kids know more than short kids? (multivariate analysis)
Theory
Proposition about what explains an outcome of interest; generalization that seeks to explain relationships between variables; helps us tell the casual story because it specifies the direction of the “casual arrow” when we observe a correlation (variable 1 –> variable 2 means that change in v1 causes a change in v2)
Endogeneity
Problem of distinguishing cause from effect
Selection bias
Part of case selection, the selection of observations for analysis such that the sample is not representative of the universe of cases (ex: online polls)
Political economy
Combination/intersection of politics and economics
Politics –> economy
Political decisions impact the economy; the economic order depends on stable political system to operate
Economy –> politics
Actions of economic actors and performance of the economic system have a major impact on politics; political order depends on the economic system to generate income, goods, and services