I am a Political Science PhD candidate at the University of Massachusetts Amherst with a focus in American politics and
political methodology. I study representation, political behavior, and experimental and survey methods. I have served as a UMass Poll Research Fellow since 2014, and I am currently the Editorial Book Review Associate for the Journal of Comparative Policy Analysis. My work has been published or is forthcoming in Political Research Quarterly, Political Behavior, Journal of Experimental Political Science, and Review of Policy Research. 

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Recent blog posts

  • Post-Stratification Raking: Questions and Answers about Creating Weights Last week I received some questions about my methods tutorial on creating post-stratification weights. Problems always arise (at least for me) when trying to apply a bit of code ...
    Posted Feb 8, 2017, 6:33 PM by Mia Costa
  • Creating Post-Stratification Weights in R My last post went over how to use pre-specified variable in a dataset to weight survey data. But what if you want to create the weights yourself? If you ...
    Posted Jun 29, 2017, 11:00 AM by Mia Costa
  • Using Weights in R In a dataset, survey weights are captured by a variable that indicates how much each respondent should “count.” For example, a respondent who has a 1 for a weight variable ...
    Posted Apr 2, 2016, 9:37 AM by Mia Costa
  • Count Models in R To demonstrate how to analyze count dependent variables, we first need to create a dependent variable that is a count. Again use the 2008 CCES survey (http://people.umass.edu ...
    Posted Mar 18, 2016, 4:50 PM by Mia Costa
  • Multinomial Logit Models in R For cases when the dependent variable has unordered categories, we use multinomial logit. For example, variable cc309 in the 2008 CESS (http://people.umass.edu/schaffne/cces08.dta) asks respondents ...
    Posted Mar 14, 2016, 11:28 AM by Mia Costa
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