This package analyzes the accuracy of property assessments and produces graphs, tables, and reports designed for general use. This package is produced by the Center for Municipal Finance, a research institute at the Harris School of Public Policy, University of Chicago.
For a detailed guide on how to use this package check out our Get started page.
You can install the development version from GitHub with:
# install.packages("devtools")
devtools::install_github("cmf-uchicago/cmfproperty")First import cmfproperty.
library(cmfproperty)To conduct our study, we need data where every roll is a unique property’s sale price and assessed value for a given year.
head(cmfproperty::example_data)
#> PIN SALE_YEAR SALE_PRICE ASSESSED_VALUE
#> 1 17273100931118 2015 53000 33860
#> 2 18013090421010 2018 80000 60390
#> 3 12111190201042 2018 118000 108300
#> 4 13093160601015 2017 125500 87200
#> 5 14322110150000 2018 3705000 3670740
#> 6 27021200080000 2016 345000 267280Then, preprocess your data with reformat_data and call make_report.
The report from the example below can be found
here.
df <- cmfproperty::example_data
ratios <-
cmfproperty::reformat_data(
df,
sale_col = "SALE_PRICE",
assessment_col = "ASSESSED_VALUE",
sale_year_col = "SALE_YEAR",
)
cmfproperty::make_report(ratios,
jurisdiction_name = "Cook County, Illinois",
output_dir = "~/../Documents/GitHub/cmf-uchicago.github.io/")
#output_dir is the directory in which report is saved; default is working directory
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