IDXNL: Stata module to provide nonlinear and interactive modelling with index covariates

Yusuf Yusuf and Francis Baidoo ()
Additional contact information
Francis Baidoo: Koforidua Technical University

Statistical Software Components from Boston College Department of Economics

Abstract: idxnl provides tools for specifying, comparing and interpreting nonlinear and interactive regression models in which a covariate is a composite index (for example, governance, ICT development or institutional quality indicators). Such indices are bounded, arbitrarily scaled and often thin in the tails, so a significant squared term is frequently read as a turning point that the data cannot support

Language: Stata
Requires: Stata version 14
Keywords: index variables; turning point (search for similar items in EconPapers)
Date: 2026-11-10
Note: This module should be installed from within Stata by typing "ssc install idxnl". The module is made available under terms of the MIT license (https://opensource.org/licenses/MIT).
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Citations:

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/i/idxnl.sthlp
http://fmwww.bc.edu/repec/bocode/i/idxdescribe.ado
http://fmwww.bc.edu/repec/bocode/i/idxdescribe.sthlp
http://fmwww.bc.edu/repec/bocode/i/idxint.ado
http://fmwww.bc.edu/repec/bocode/i/idxint.sthlp
http://fmwww.bc.edu/repec/bocode/i/idxnl_cert.do
http://fmwww.bc.edu/repec/bocode/i/idxnl_example.dta
http://fmwww.bc.edu/repec/bocode/i/idxnl_examples.do
http://fmwww.bc.edu/repec/bocode/i/idxspec.ado
http://fmwww.bc.edu/repec/bocode/i/idxspec.sthlp
http://fmwww.bc.edu/repec/bocode/i/idxtp.ado
http://fmwww.bc.edu/repec/bocode/i/idxtp.sthlp
http://fmwww.bc.edu/repec/bocode/_/_idxnl_cd.ado
http://fmwww.bc.edu/repec/bocode/_/_idxnl_dkrepost.ado
http://fmwww.bc.edu/repec/bocode/_/_idxspec_iv.ado
http://fmwww.bc.edu/repec/bocode/_/_idxspec_simex.ado
http://fmwww.bc.edu/repec/bocode/_/_idxtp_core.ado
http://fmwww.bc.edu/repec/bocode/r/run_idxnl_certification.do

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