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Repair CDAP estimation#1026

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jpn-- merged 6 commits intoActivitySim:mainfrom
driftlesslabs:patch-595
Jan 8, 2026
Merged

Repair CDAP estimation#1026
jpn-- merged 6 commits intoActivitySim:mainfrom
driftlesslabs:patch-595

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@jpn-- jpn-- commented Dec 11, 2025

This pull request fixes an error in Larch estimation of the CDAP model, reported in #595. There was a bug in the code, where interaction terms for 3, 4, and 5 person households adopting an all-M, all-N, or all-H patterns were all mapped to the same coefficient; the original model structure has unique parameters for each household size. [1] [2]

Testing and validation

  • Expanded the test_cdap_model test to include assertions verifying the correct assignment of interaction parameters, specifically checking the presence and absence of wildcard coefficients for different model sizes.
  • Updated the regression test data in test_cdap_model_loglike.csv to reflect changes in log-likelihood values resulting from the repaired coefficient mapping logic.

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Fix looks good. Suggest we add more detail to the change log, and one minor typo to fix.

coef_N_88,-0.05952606764773704,-0.05952606764773704,0.87709999999999999,0
coef_N_xxx,-0.89914972777069246,-0.89914972777069246,-0.36530000000000001,0
coef_N_xxxx,-0.72130413279127681,-0.72130413279127681,-1.3460000000000001,0
coef_N_xxxxx,-6.6290578146794195,-6.6290578146794195,-3.4529999999999998,0
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Happy to see the additional coef_xxx and coef_xxxx coefficients. All these coefficients across M,N, and H make a lot more sense now with a strong negative coefficient for everyone in a 5-person household doing the same thing.

@jpn-- jpn-- merged commit 0811191 into ActivitySim:main Jan 8, 2026
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dhensle added a commit to RSGInc/activitysim that referenced this pull request Mar 4, 2026
commit c031c8b
Author: David Hensle <hensle93@gmail.com>
Date:   Fri Feb 13 15:48:35 2026 -0800

    adding ignore list to skim load for unused skims

commit 83613b2
Author: Copilot <198982749+Copilot@users.noreply.github.com>
Date:   Thu Feb 12 16:30:58 2026 -0600

    Fix Sphinx currentmodule directive for location choice documentation (ActivitySim#1034)

    * Initial plan

    * Fix currentmodule directive in work_location_choice.md and school_location_choice.md

    Co-authored-by: jpn-- <1036626+jpn--@users.noreply.github.com>

    ---------

    Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
    Co-authored-by: jpn-- <1036626+jpn--@users.noreply.github.com>

commit aa58cc4
Author: David Hensle <51132108+dhensle@users.noreply.github.com>
Date:   Fri Jan 16 03:31:07 2026 +1100

    Fix for zones reopening in simulation-based constraint mechanism for work/school location choice (ActivitySim#1028)

    * addresses issue with zones reopening after being closed in shadow_pricing

    * addresses issue with zones reopening after being closed in shadow_pricing

    * adding shadow price regression values

    * updating change log

    ---------

    Co-authored-by: juangacosta <juan.acosta@rsginc.com>

commit 6266ce4
Author: David Hensle <51132108+dhensle@users.noreply.github.com>
Date:   Thu Jan 8 10:26:48 2026 -0800

    Index names consistently set to "alt" for alternatives files (ActivitySim#1018)

    * "alt" now used as index in all alternatives modules

    * formatting

    * minor commenting

    * using stable sorting for unit test

    * adding to change log

    * updating school escort bundle Alt to alt

    * typo

    * Revert "updating school escort bundle Alt to alt"

    This reverts commit 625f685.

    * regenerate pipeline

    ---------

    Co-authored-by: juangacosta <juan.acosta@rsginc.com>
    Co-authored-by: Jeffrey Newman <jeff@driftless.xyz>

commit 0811191
Author: Jeffrey Newman <jeff@driftless.xyz>
Date:   Thu Jan 8 11:11:43 2026 -0600

    Repair CDAP estimation (ActivitySim#1026)

    * fix error in CDAP estimation model construction

    * update tests for CDAP

    * fix the other test file

    * add to changes.md

    * note on possible fixes
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2 participants