Analysis behind the "How the Cook County Assessor Failed Taxpayers"
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README.md
appeals-analysis.R
first-pass.R
sales-ratio-study.R

README.md

How We Analyzed Commercial and Industrial Property Assessments in Chicago and Cook County

This code was used for the analysis in the story,"How the Cook County Assessor Failed Taxpayers."

Methodology for this project can be found here.

Data can be found in the ProPublica Data store here.

The scripts used for this project are all R scripts that can be run in R Studio.

To examine the fairness and accuracy of commercial and industrial property assessments under Cook County Assessor Joseph Berrios, ProPublica Illinois and the Chicago Tribune conducted three separate analyses:

  • An examination of unchanged assessor’s initial valuations over multiple reassessment periods. Methodology for this analysis is here. Analysis code can be found in first-pass.R

  • A sales ratio study comparing the assessor’s valuations to actual sales prices. Methodology for this analysis is here. Analysis code can be found in sales-ratio-study.R

  • A look at appeals of commercial and industrial assessments in Cook County. Methodology for this analysis is here. Analysis code can be found in appeals-analysis.R