Modeling Individual Choice with NLOGIT: Data Analysis

These are some of the features of the program operation of importing data and exporting data from NLOGIT to other programs - the READ (import) and WRITE (export) operations. You can also transform and examine the data within the program.

Read (import data)

  • ASCII, XLS, WKS, binary, DIF, CSV
  • Supported by DBMS/Copy and Stat/Transfer
  • Up to 3,000,000 observations
  • Merge choice specific (attribute) and generic (characteristic) data in a panel data set format
  • Multiple line data input or single line (e.g., from Gauss)

Write (export data)

  • ASCII
  • CSV (can be read directly into Excel, Lotus)
  • DIF
  • Binary
  • WKS
  • NLOGIT system files can be read by Stat/Transfer and DBMS/Copy

Choice Sets

  • Fixed number of choices
  • Variable number of choices out of universal choice set
  • Variable number of choices from individual choice sets

Data formats for discrete choice models

  • Individual choice data
  • Frequencies or market shares (proportions)
  • Ranks
  • Automatic bypass of observations with missing data
  • Panel data estimators for multinomial choice

Transformations

  • All algebraic transformations
  • Recoding
  • Sorting
  • Existing or new variables
  • Spreadsheet style data editor
  • Convert data sets from single to multiple line observations
  • Scaling for merging revealed and stated preference data sets

Weighting

  • Individual observation weights
  • Choice based sampling corrections in all models