POLI 3000 Lecture 4: 2-21 week 6
22 May 2018
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Common themes/ errors in homework:
1. Theory is NOT the data
a. Scope of the data is not the same thing as the scope of the theory
b. Unit of analysis: pot hole study—measures are not same as unit of analysis
i. Unit of analysis: neighborhoods.
ii. Theory: is about individuals standing in the voting box.
iii. The analysis is at the neighborhood.
2. Reverse causality and simultaneity both go hand in hand normally.
Midterm stuff
Short answer.
Scenarios.
5 multiple choice questions
I. Percent v percent change
a. %= rate per hundred. Use rates with large numbers
b. Percent change: relative to old value
i. = ((new—old)/old) X 100
ii. Need to know what your baseline is
iii. What was the old value? Going 1 person to 5, that is 400% increase
II. Odds vs proportions. Odds are proportion
a. Proportion= 6 blues, 3 red, 2 yellow, 1 green
b. Odds: number of successes/ total number of failures
c. Probability: # of successes/ total number of possible outomces
III. Describing variables
a. Variable= empirical measurement that varies
b. Three types of measurement metrics
i. Categorical/ nominal
1. Assign numbers because we feel like we have to
2. These numbers have no meaning
3. Race. 0= white, 1=black, 2= Asian pacific
ii. Ordinal variable
1. There is an order.
2. Never, once a year, 2-5 years, 5-10 times a year, weekly
3. How often do you go to church?
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