Comparison of Logit Models to Machine Learning Algorithms for Modeling Individual Daily Activity Patterns
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1 Comparison of Logit Models to Machine Learning Algorithms for Modeling Individual Daily Activity Patterns Daniel Fay, Peter Vovsha, Gaurav Vyas (WSP USA) 1
2 Logit vs. Machine Learning Models Logit Models: Convenient model properties Easy replication of observed aggregate shares Suffer from combinatorial explosion of alternatives Mostly linear additive specifications of utilities Machine Learning Models: Capture non-linear affects of variables and their combinations Many different ML methods available Prioritize individual prediction rather than aggregate shares Suffer from systematic over/under predictions 2
3 Research Focus Individual prediction of daily activity pattern types as part of ABM Resolving combinatorial explosion of alternatives Applying model constraints to decision trees Behavioral insights from combinations of variables provided by decision trees 3
4 Individual Daily Activity Pattern Types (DAP) 3 categories for each person-day: Mandatory at least one work, university or school trip Non-mandatory at least one non-mandatory trip with no mandatory trips Home no participation in out-of-home activities Distinct travel patterns for each type DAP Mandatory Non-Mandatory Home 4
5 Modeling Coordinate Daily Activity Patterns Important to model DAP type for household members simultaneously Trinary choice model applied to household members jointly Leads to explosion in number of alternatives 3 Person Family 7 Person Family 2187 Combinations 27 Combinations 5
6 Machine Learning applied to DAP Objectives: Precision of DAP predicted individual and aggregate shares Find method to resolve combinatorial explosion of set of alternatives Identify key variable combinations and the non-linear impacts 6
7 Machine Learning applied to DAP Individual Accuracy: Random Forest Model Logit Model 7
8 Machine Learning applied to DAP Resolving Combinatorial Explosion: Adjusted initial random forest probabilities using correlations between patterns Pairwise correlations Performed iteratively until convergence Eliminates explosion of choices pertinent to Logit models IDAP Correlation Matrices Household Travel Survey Random Forest Classifier DAP Probabilities Adjustments to IDAP Probabilities Adjusted DAP Probabilities 8
9 Random Forest Classifier applied to DAP Aggregate Accuracy: 9
10 Applying Constraints to Decision Trees to guarantee desired model elasticity Age Gender Gender Income Income Income Income Constrain first splits of decision tree Find optimal split at each leaf node Train subsequent branches of the tree 10
11 Key Combinations of Variables Retirees 150k Income 75k Non-Mandatory Home 0k Age 11
12 Key Combinations of Variables Pre-School Children Non-Worker at Home Yes No Non-Mandatory Home Mandatory Age 12
13 Key Combinations of Variables Pre-School Children 4 years or older No non-worker at home Full-time worker at home? Yes Home No Non-worker with nonmandatory activity? Yes No Non-mandatory Mandatory 13
14 Key Combinations of Variables Full-Time and Part-Time Workers Part-time worker 29 years or older Gender Male? Yes Mandatory No Pre-school child at home? Yes No Home Mandatory 14
15 Key Combinations of Variables Non-workers and Retirees 79 years or younger Income 75k or more? Yes Non-mandatory No More cars than workers? Yes No Non-mandatory Home 15
16 Conclusions ML methods represent a viable alternative to traditional logit models for complex multi-dimensional choices. They may improve the individual model fit significantly ML may systematically over-predict or under-predict certain choices; in this regard, making ML models easy to calibrate in aggregate sense is an important direction ML methods indeed provide some additional insights into travel behavior by revealing certain non-linear combinations of variables that otherwise are difficult to guess and test with traditional logit models However some concerns have to be addressed before we can put ML in practice. 16
Danny Givon, Jerusalem Transportation Masterplan Team, Israel
Paper Author (s) Gaurav Vyas (corresponding), Parsons Brinckerhoff (vyasg@pbworld.com) Peter Vovsha, PB Americas, Inc. (vovsha@pbworld.com) Rajesh Paleti, Parsons Brinckerhoff (paletir@pbworld.com) Danny
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