You may find this data set in the `openintro` R package (via the `usdata` package or on this page.
The Pierce County sales dataset (pierce_county_house_sales) is 2020 house sales from the second largest county, by population, in Washington State. House sales data is used every day by realtors, prospective buyers, homeowners, and tax assessors to determine current value and to predict future value.
There are many variables to analyze. Number of bedrooms, number of bathrooms, square feet, size of attached garage, heating source, view and year built may all be factors in the house price. Correlation tests can identify what are the most important variables.
The data has outliers, demonstrating why median sale price is used in the real estate industry instead of mean sale price. The scatterplot below helps us identify sales price outliers every month. Two data points are over $6 million, far in excess of the other sales.
