*! version 1.0 Aug2014
help nredound (SJ15-3: st0409)

Title

nredound -- Estimate the number of redundant parameters within the specified list of fixed effects

Syntax

nredound varlist [if] [in]

Description

nredound uses an algorithm based on the one described in Abowd, Creecy, and
Kramarz (2002) to calculate the number of redundant parameters within the
specified list of categorical variables in varlist.

Remarks

The program uses the commands a2group, tuples, and
distinct.

Examples

. webuse nlswork

. nredound ind_code occ_code idcode year

. nredound ind_code occ_code idcode year if age>15

Stored results

nredound stores the following in e():

Scalars

e(M) the number of redundant parameters

Reference

Abowd, J. M., R. H. Creecy, and F. Kramarz. 2002. Computing person and
firm effects using linked longitudinal employer-employee data.
Technical Paper No. TP-2002-06, Center for Economic Studies, U.S. Census
Bureau. http://www2.census.gov/ces/tp/tp-2002-06.pdf.

Author

Fernando Rios-Avila

Levy Economics Institute of Bard College

Blithewood-Bard College

Annandale-on-Hudson, NY

friosavi@levy.org

Also see

Article: Stata Journal, volume 15, number 3: st0409