Exploiting Geographic Dependencies for Real Estate Appraisal
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1 Exploiting Geographic Dependencies for Real Estate Appraisal Yanjie Fu Joint work with Hui Xiong, Yu Zheng, Yong Ge, Zhihua Zhou, Zijun Yao Rutgers, the State University of New Jersey Microsoft Research Asia, UNC Charlotte, Nanjing University York City, NY
2 Agenda 2 Background and Motivation Problem Statement Methodology Evaluation Conclusions
3 Housing Matters 3 Win your lover Zillow Settle down your family Realtors Make extra money as investment Yahoo Homes housing consultant services Call for an intelligent system to rank estates based on estate investment value
4 Quantifying Estate Investment Value 4 We don t predict future price We predict growth potential of resale value (long term thing) Return Rate: Prepare the benchmark investment values of estates for training data Value-adding capability (in Rising Market) Value-protecting capability (in Falling Market)
5 What Special In Estate Location! Location! Location! Urban geography (poi, road networks) features the geographical utility of houses Human Mobility reflects neighborhood popularity of houses Prosperity of Business Area
6 Geographic Dependencies (1) 6 Your personal profiles tell your research interests Point of Interest Transportation Accessibility Taxi Mobility Individual dependency the investment value of an estate is determined by the geographic characteristics of its own neighborhood
7 Geographic Dependencies (2) 7 Your friends tell your research interests A B A B Attribute A B Distance to Level2 road network 156 meters 143 meters Distance to subway station 1385 meters 1585 meters #Restaurants 3 4 #Transportation facilities 8 8 Peer dependency Inside a business area, value can be reflected by its nearby estates.
8 Geographic Dependencies (3) 8 Your associated research groups tell your research interests Depressed business area Rising Market Period (02/ /2012) Prosperous business area Depressed business area Average regional prices Prosperous business area Average regional prices Zone dependency The estate value can also be influenced by the values of its associated latent business area.
9 Problem Definition 9 Given Urban geography (poi, road networks) Human mobility (taxi GPS traces) Estates with locations and historical prices Objective Rank estates based on their investment values Core tasks Predict estate investment value using urban geography and human mobility Jointly model three geographic dependencies as objective function to learn estate ranking predictor
10 Methodology Overview 10 Estate Investment Value Location Location Geographic Utility Urban Geography Neighborhood Popularity Influence of Business Area s Prosperity Human Mobility Business Area Prediction Model Road Networks Bus Stops Objective Function Subway Stations Places of interests Individual Individual Dependen Dependen cy cy Cell -Tower Traces Bus Traces Taxicab GPS Traces Check-ins Peer Peer Dependen Dependen cy cy Zone Zone Dependen Dependen cy cy
11 11
12 Modeling Estate Investment Value (1) 12 Geographic Utility Feature extraction by spatial indexing linearly regress geographic utility from geographic features of the neighborhood of each estate
13 Modeling Estate Investment Value (2) 13 Influence of business area (A generative view) There are K business areas in a city Each business area is a cluster of estates; estates tend to co-locate along multiple business areas The more prosperous, the more easier we identify an estate from business area Prosperities of K business areas The prosperities of K business areas (K spatial hidden states ) show influence on estates The inverse influence of geo-distance between estate and business area center Gaussian Mixture Model + Learning To Rank
14 Modeling Estate Investment Value (3) 14 Neighborhood Popularity (A propagation view) Propagate visit probability to POIs per drop-off point Aggregate visit probability per POI Aggregate visit probability per POI category Compute popularity score Spatial propagation and aggregation from taxi to house Taxi Passenger (drop-off point) Point of Interests Categories of POI House
15 Generative Processes
16 Modeling Three Dependencies
17 Parameter Estimations
18 Experimental Data 18 Beijing real-world Data Beijing estate data 2851 estates with transaction records from 04/2011 to 09/2012 Falling market(04/2011 to 02/2012) and Rising market (02/2012 to 09/2012) Beijing transportation facility data including bus stop, subway, road networks Beijing POI data Beijing taxi GPS traces
19 Evaluation Methods and Metrics 19 Baseline algorithms MART: it is a boosted tree model, specifically, a linear combination of the out puts of a set of regression trees RankBoost: it is a boosted pairwise ranking method, which trains multiple weak rankers and combines their outputs as final ranking Coordinate Ascent: it uses domination loss and applies coordinate descent for optimization ListNet: it is a listwise ranking model with permutation top-k ranking likelihood as the objective function Evaluation metrics Normalized Discounted Cumulative Gain (NDCG) Precision Recall Kendall s Tau Coefficient
20 Overall Performances 20 We investigate the ranking performances by comparing to baseline algorithms in terms of Tau, NDCG, Pecision and Recall
21 Overall Performances 21 We investigate the ranking performances by comparing to baseline algorithms in terms of Tau, NDCG, Pecision and Recall
22 Study on Geographic Dependencies 22 We study the impact of three geographic dependencies by designing different variants of objective function (posterior likelihoods) Individual dependency can achieve good overall ranking performance; Peer and zone dependency can achieve good top-k ranking performance; We recommend combination usage of three dependencies
23 Hierarchy of Needs for Human Life (1) 23
24 Hierarchy of Needs for Human Life (2) 24 The triangle need structure of human life in Beijing
25 Conclusions 25 Housing analysis is funny Use urban geography and human mobility to model estate investment value Capture geographic individual, peer, and zone dependencies to better learn estate ranking predictor Business applications Decision making support for homebuyers Improve price structure for housing agent/broker/consultant Optimize site selection for housing developer
26 26 Thank You! Homepage:
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