stats5 - Monday September 13 POLS4150 RESEARCH METHODS IN...

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Monday, September 13 http://emwilk.myweb.uga.edu/POLS4150.html Course Webpage: POLS4150 – RESEARCH METHODS IN POLITICAL SCIENCE (90595) Necessary & sufficient conditions Homework #1 due on Friday Measurement Exam # 1 on Wednesday, September 22
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1. Being a mother is a sufficient condition for being a female Necessary vs. Sufficient Conditions 2. Being a mother is a necessary condition for being a female 3. Being a female is a sufficient condition for being a mother 4. Being a female is a necessary condition for being a mother 5. Being greater than 15 is a sufficient condition for being less than 20 6. Being greater than 15 is a necessary condition for being less than 20 7. Being less than 20 is a sufficient condition for being greater than 15 True False False True False False False
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8. Being less than 20 is a necessary condition for being greater than 15 Necessary vs. Sufficient Conditions 9. Being less than 12 is a sufficient condition for being less than 20 10. Being less than 12 is a necessary condition for being less than 20 11. Being less than 20 is a sufficient condition for being less than 12 12. Being less than 20 is a necessary condition for being less than 12 13. Being an equilateral rectangle is a sufficient condition for being a square 14. Being an equilateral rectangle is a necessary condition for being a square False True False False True True True
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Measurement – quantifying our concepts Measurement Operational Definitions Goal is to develop reliable and valid measures Concept: Pork Federal $ received by each district? Earmarks won for each district? Operational Definition Dollars? Number of projects / earmarks? Example: how researchers define the concepts that will be measured should capture the meaning of our concepts as accurately as possible
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Measurement Reliability – Measures yield consistent results Example: Bathroom vs Gym scale Home scale says you weigh 170 Gym scale says you weigh 175 Today: Home scale says you weigh 170 Gym scale says you weigh 175 Tonight: Both scales are reliable!
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Measurement Reliability – Measures yield consistent results Home scale says you weigh 170 Gym scale says you weigh 175 Today: Home scale says you weigh 170 Gym scale says you weigh 170 Tonight: Gym scale is not reliable! Example: Bathroom vs Gym scale
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Measurement Reliability – Measures yields consistent results Is presidential approval a reliable measure of support for the presidency? Does presidential approval measure the same attitudes at these points in time: September 12, 2001 January 1998 July 1974 November 1994 Today
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Measurement Validity – yields accurate results Does measures capture the concept in question?
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