A technique for estimating the relative likelihood that specific parcels or groups thereof will sell within a selected time, possibly including such steps as : Responsive to location of each parcel with respect to other parcels that have recently sold, including receiving a 1st kind of information, associated with sales in a neighborhood for each parcel being examined, including a set of attributes. Deriving additional attributes for each parcel based on its attributes and others near it. Determining independently for each neighborhood which of those attributes are more important for estimating relative likelihood of sale. Determining a degree of similarity between each unsold parcel and each recently-sold parcel, in response to those sets of attributes, weighted in response to relative importance. Providing a 2nd kind of information, ordering parcels by a relative likelihood of sale within a selected time.