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Research Methods in PSCI
Research Methods used for Data within the Political Science Field
40
Political Studies
Undergraduate 2
12/12/2008

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Term
Aggregate Data
Definition
Pertains to groups of Cases
Term
Ecological Fallacy
Definition
False conclusions made by assuming relationships found through research groups can be attributed to individuals
Term
Additive Index
Definition
A measure combining different aspects of the same concept
Term
Multiplicative Index
Definition
A measure combining different but related concepts
Term
In what situations would you construct a multiplicative index?
Definition
Standardized Measures: Organizing Data, making it relevant, anything per certain number of people
Term
Statistical Significance
Definition
The amount of risk you're willing to take that you will reject your null hypothesis
Term
Null Hypothesis
Definition
Rejection of your original hypothesis
Term
Type I Error
Definition
When you reject your null hypothesis and it's really true
Term
Type II Error
Definition
When you accept a false null hypothesis
Term
Significance v. Meaningfulness
Definition
Whether or not the data is applicable.
Term
Significance is...
Definition
Data Based
Term
Meaningfulness is ...
Definition
Relevance
Term
Observed Counts
Definition
What actually happened
Term
Expected Counts
Definition
What was expected to happen
Term
Chi-Squared Statistic
Definition
Used to tell the significance between two nominal Variables, two ordinal Variables or a Nominal and an Ordinal Variable
Term
Independent Samples T-Test
Definition
Determines if a sample mean agrees with the expected or plain population mean [just tests how unlikely sample results are]
Term
When is a T-Test used?
Definition
It is used when you're running a comparison between Nominal/IR or Ordinal/IR
Term
What are the Measures of Association?
Definition
Lambda and Gamma
Term
When is Lambda used?
Definition
Nominal-Nominal and Nominal/Ordinal
Term
When is Gamma used?
Definition
Ordinal/Ordinal Only.
Term
What is a PRE Statistic?
Definition
It measures the reduction error.
Term
Which Statistics have this PRE interpretation?
Definition
Lambda and Gamma
Term
When is the Correlation Coefficient used?
Definition
IR/IR
Term
Bivariate Regression: When is it used and what is the formula?
Definition
It is a procedure for deriving the equation that relates a single metric dependent variable and a
single metric independent variable.

y=a+b(x)
Term
Define the Formula
Definition
A=Constant
B=Regression Coefficient, R Squared
Y= Independent Variable
X = Will always be a percentage. Change to decimal.
Term
What is R Squared?
Definition
R Squared measures fitness to regression line.
Term
What is the Multiple linear regression equation?
Definition
y=a+b1(x1)+b2(x2)...Bn(Xn) -- B and X will change
Term
What are the 5 sections of any statistical empirical political science article?
Definition
Intro, Lit Review, Research Design, Analysis/Results, Conclusion
Term
Why is the concept of Statistical Significance important in assessing empirical evidence concerning democratic peace?
Definition
Because everything could've been by random chance. Just because it's never happened, doesn't mean it wont ever, therefore without Statistical Significance, the concept is meaningless.
Term
What are the advantages of Using Statistical Methods?
Definition
Allows political scientist to gather information for large number of cases, makes the terms of debate more explicit, entails the standards of evidence, permits the assessments to the claim of chance, casual inferences, testing two explanations against each other with precision
Term
What are the Errors of Specification?
Definition
1. Too much calculation without paying attention to theory
2. Theory is often too weak and difficult to test
3. Imposing Statistical models.
Term
What are the Errors of Inference?
Definition
1. Blind application of Statistical Significance to judge the importance of a variable
2. Accepting or rejecting a theory by examining one data set to assess whether or not the effect of one variable on another can reliably be distinguished from zero
3. Sin of Commission
Term
What is the Rule of Thumb for R Squared?
Definition
Values over .3 or meaningful
Values between .2 and .3 are Marginal
Values below .2 are not very meaningful
Term
less or equal to 0.05 [t-test, Levenes Test]
Definition
variances of groups are significantly different
Term
Greater than 0.05 [t-test, Levenes Test]
Definition
not significantly different
Term
If Levene Test IS Significant
Definition
look at bottom row.
Term
If Levene Test is NOT significant
Definition
Look at top row
Term
Nominal
Definition
Persons Name, Sex, address, Phone Number, qualitative categories
Term
Ordinal
Definition
Rank; First, Second, Third
Term
Interval Ratio
Definition
Increments: Degrees, Years
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