ex3_2010 - Sociology 63993Exam 3Page 1 S o c i o l o g y 6...

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Unformatted text preview: Sociology 63993Exam 3Page 1 S o c i o l o g y 6 3 9 9 3 E x a m 3 M a y 4 & 7 , 2 0 1 0 I. True-False. (20 points) Indicate whether the following statements are true or false. If false, briefly explain why. 1. The use of standardized coefficients is one way to effectively deal with problems of random measurement error in variables. 2. Robust regression techniques should be used to estimate nonrecursive models. 3. The log odds of an event occurring are 0. This means that the event cannot happen. 4. Y is regressed on X in two different populations. In both populations, the estimated Beta coefficient equals 3. This means that the R 2 value will also be the same in the two populations. 5. After running an ordered logit model, a researcher obtains the following: . brant Brant Test of Parallel Regression Assumption Variable | chi2 p>chi2 df -------------+-------------------------- All | 49.18 0.000 12 -------------+-------------------------- yr89 | 13.01 0.001 2 male | 22.24 0.000 2 white | 1.27 0.531 2 age | 7.38 0.025 2 ed | 4.31 0.116 2 prst | 4.33 0.115 2 ---------------------------------------- These results suggest that the assumptions of the model have been violated in this analysis. II. Short answer . (25 pts each, 50 pts total). Answer both of the following. II-1. (25 points): After several setbacks in recent elections, supporters of gay marriage are cautiously optimistic about their prospects for the future. A small but growing number of states have legalized gay marriage. In January 2010, Ted Olson (George Bushs attorney in Bush versus Gore 2000) surprised many by writing an article for Newsweek entitled The conservative case for gay marriage . A February 2010 study by the Pew Research Center found that young adults were much less opposed to gay marriage than were older generations. Still, gay rights supporters know there is a long struggle ahead. They want to better understand the factors that influence attitudes toward gay marriage. On the one hand, they believe that having gay friends, or living in a state that has legalized gay marriage, will lead to more favorable attitudes. At the same time, they believe that certain demographic characteristics, such Sociology 63993Exam 3Page 2 as race and age, will also have an effect. They have therefore collected data from more than 10,000 American adults on the following: Variable Description gaymarr 1 = supports gay marriage, 0 = opposes it gayfriends 1 = has 1 or more gay friends, 0 = no gay friends legalstate 1 = lives in a state where gay marriage is legal, 0 = gay marriage is not legal in the state black 1 = black, 0 = not black agecentered Age of respondent (centered to have a mean of 0) They obtain the following results (some extraneous output is deleted): . nestreg, lr: logit gaymarr gayfriends legalstate (agecentered black), nolog Block 1: gayfriends Logistic regression Number of obs = 10335 LR chi2(1) = 1493.81 Prob > chi2 = 0.0000 Log likelihood = -6403.8352 Pseudo R2 = 0.1045 0....
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ex3_2010 - Sociology 63993Exam 3Page 1 S o c i o l o g y 6...

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