Modeling Individual Choice with NLOGIT: Model Specification
Commands for NLOGIT use LIMDEP’s standard command syntax. NLOGIT also provides command builder dialog boxes for most model specifications
Model sizes
- Up to 100 choices in choice sets
- Up to 125 parameters in utility functions
- Tree structures may have up to 25 branches, 10 limbs, 5 trunks in 4 levels
Data setup
- Individual choice, frequencies, proportions, or ranks
- Scaling of data for merging revealed and stated preference data
- Size variables for multiplicative models
- Weighting for choice based sampling
- Automatic handling of missing data
- Multiple observations (panel data) for several models
Utility specifications
- LIMDEP standard command structure for equation specification
- Choice specific constants
- Interactions of choice specific constants and characteristics
- Within and across equation parameter constraints
- Fixed parameters in utility functions
- Logs and Box-Cox transformed variables
- Size variables for multiplicative models
- Scaling of sets of variables and observations
Choice sets
- Up to 100 choices
- Fixed or variable number of choices
- Universal choice set or individual specific choice sets
- Restricted choice during estimation
Results
- Compute and save utilities
- Fitted probabilities
- In sample and out of sample predictions
- Log sums (inclusive values) for all tree levels
- Display tree structure
- Descriptive statistics by choice and attribute
- Crosstab of predicted and actual choice
- List of fitted probabilities with predicted and actual choice
- Elasticities and marginal effects
- All standard model output, coefficients, standard errors, fit measures, diagnostic statistics
- All post estimation analysis tools for hypothesis tests (LR, LM, Wald)