There are many factors that go into generating a valuation. The key factors in comparable method include transaction time period, geographical location, floor area, floor number, property type and tenure.
For machine learning method, the top 6 features are floor area, floor number, resale comparable price, property age, new sale comparable price and distance to MRT.
Resale comparable are average price per square feet of 5 nearby resale transactions within a year.
New sale comparable is similar to resale comparable but for new sale transactions.
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