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Wallace Hall Princeton University   nisopr@princeton.edu      

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NIS Restricted Data

Restricted data comprises those fields and variables that potentially enable identification of survey respondents either directly or through deductive identification. Determination of which variables are included in the restricted and public use data sets is based on the disclosure risk and the consequences of disclosure of each variable. The public use data include only variables with low disclosure risk and low levels of sensitivity.

The NIS has created two versions of Restricted Data Files for both Rounds (Round 1 and Round 2), each of which involves access requirements and data security:

Version 1:
Mid- to high-level of Restricted Data. This file includes individual characteristics reported in the interviews. In an effort to maximize the data available to data users, most of these variables were included in the public use file after some sort of transformation, such as top coding, categorization of continuous variables, or collapsing of categorical responses. Version 1 of the Restricted Data File will contain unmodified variables for country of origin, destination states of previous trips, education, health conditions, employment, religion, occupation and industry, among others.

Version 2:
Highest level of Restricted Data. This file adds geographic identifiers describing the characteristics of the place at time of interview (state, city, and zip code), as well as some selected variables from the INS records about the sampled respondents (i.e. class of admission, visa category, country of birth, country of chargeability, country of last residence, etc.). Release of this version of the restricted data requires that it be stored within a secure data enclave.

These versions are discussed in detail in the NIS Restricted Data Access Policy.


 
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