Evaluation of Residential Housing Prices on the Internet: Data Pitfalls

Table 1

List of the statistical indices for validation used to compare for-profit real estate information website housing prices with the official data.

Validation Statistical Index	Equation	Perfect Value
Pearson correlation coefficient (R)		1
Root Mean Squared Error (RMSE)		0
Mean Absolute Error (MAE)		0
Relative Bias (BIAS)		0

Note: number of months is represented by n; P and O are the for-profit real estate information website housing prices and the official data, respectively.