statistical methods for comparing of 2 1-year surveys

stat_analyst over 8 years ago

We would like to compare a percent from a 2013 single year dataset with the same percent from the 2014 single year data set. Can we use statistical methods that require independent samples like a chi - square test? Although different people may have been surveyed in the two years, I don't believe one year is independent of the next year because the samples represent the same population.

Thank you in advance for your help or thoughts.

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Beth Jarosz over 8 years ago

ACS years are independent samples, but, stat_analyst, you are correct that Chi-Square is not an appropriate test of significance because Chi-Square is generally used to test differences across categories (i.e. distinct populations).

You are also correct that what you'd want to use is the z-score test described by the Census Bureau in this document: www2.census.gov/.../MultiyearACSAccuracyofData2013.pdf
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stat_analyst over 8 years ago in reply to Beth Jarosz

Beth,

Would you say that any statistical test requiring independence would be inappropriate? Another one that has been suggested in my group is to put two years of pums data together and use year as a variable in a regression. This model also requires that the two years are independent.
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stat_analyst over 8 years ago in reply to Beth Jarosz

Beth,

Would you say that any statistical test requiring independence would be inappropriate? Another one that has been suggested in my group is to put two years of pums data together and use year as a variable in a regression. This model also requires that the two years are independent.
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