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在某些年份（1978、1980年和1982～1985年），部分问题只询问了受访者的一个子样本。虽然目的是要保证这些问题针对一个随机人群，但这不总是可以实现（Smith and Peterson，1986）。因此，GSS提供了一个修正权重FORMWT。我的建议是，你们不要使用这个变量，而要用多元填补法（见第8章）创建一个包括所有受访者的完整数据集。
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汇合多年调查数据
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当我们汇合多年的调查数据时，合理的做法是将YEAR作为层变量，因为每年的调查是独立进行的，YEAR是一个固定变量。执行此步骤的Stata命令是：
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svyset sampcode ［pweight=newwt］，strata（year）
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量化数据分析：通过社会研究检验想法 参考文献
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Abadie，Alberto，and Javier Gardeazabal. 2003. The economic costs of conflict：A case study of the Basque country. American Economic Review 93（1）：113-132.
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1702650997
——，David Drukker，Jane Leber Herr，and Guido W. Imbens. 2004. Implementing matching estimators for average treatment effects in Stata. Stata Journal 4（3）：290-311.
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1702650999
Agresti，Alan. 2002. Categorical data analysis. 2nd ed. New York：Wiley-Interscience.
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Allison，Paul D. 2001. Missing data. Sage university papers series on quantitative applications in the social sciences，07-136. Thousand Oaks，CA：Sage.
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——. 2005. Fixed effects regression methods for longitudinal data using SAS. Cary，NC：SAS Institute Inc.
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1702651005
Almond，Douglas. 2006. Is the 1918 influenza pandemic over？Long-term effects of in utero influenza exposure in the post-1940 U. S. population. Journal of Political Economy 114（4）：672-712.
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1702651007
Aly，Hassan Y. ，and Michael P. Shields. 1991. Son preference and contraception in Egypt. Economic Development and Cultural Change 39（2）：353-370.
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Anderson，Andy B. ，Alexander Basilevsky，and Derek P. J. Hum. 1983. Missing data：A review of the literature. Pp. 415-494 in Handbook of survey research，edited by Peter H. Rossi，James D. Wright，and Andy B. Anderson. New York：Academic Press.
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Andrews，Frank M. ，James N. Morgan，John A. Sonquist，and Laura Klem. 1973. Multiple classification analysis：A report on a computer program for multiple regression using categorical predictors. 2nd ed. Ann Arbor：University of Michigan，Institute for Social Research.
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1702651013
Angrist，Joshua D. 1990. Lifetime earnings and the Vietnam era draft lottery：Evidence from Social Security Administration records. American Economic Review 80（3）：313-336. ［See also the Errata，80（5）：1284-1286. ］
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1702651015
Anscombe，F. J. 1973. Graphs in statistical analysis. American Statistician 27（1）：17-22.
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Ansolabehere，Stephen，James M. Snyder，Jr. ，and Charles Stewart Ⅲ. 2000. Old voters，new voters，and the personal vote：Using redistricting to measure the incumbency advantage. American Journal of Political Science 44（1）：17-34.
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1702651019
Ashenfelter，Orley，and Alan Krueger. 1994. Estimates of the economic return to schooling from a new sample of twins. American Economic Review 84（5）：1157-1173.
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Astone，Nan Marie，Robert Schoen，Margaret Ensminger，and Kendra Rothert. 2000. School reentry in early adulthood：The case of inner-city African Americans. Sociology of Education 73（3）：133-154.
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Baltagi，Badi H. 2005. Econometric analysis of panel data. 3rded. New York：Wiley.
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Barkan，Steven D. ，and Susan F. Greenwood. 2003. Religious attendance and subjective well-being among older Americans：Evidence from the General Social Survey. Review of Religious Research 45（2）：116-129.
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Barker，D. J. P. 1998. Mothers，babies，and health in later life. Edinburgh：Churchill Livingstone.
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Barnes，Samuel H. ，and Max Kaase. 1979. Political action：An eight nation study，1973-1976. Machine readable data file. Samuel H. Barnes and Max Kaase［principal investigators］；Ann Arbor：Inter-university Consortium for Political and Social Research［distributor］.
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