PolicyEngine/microcosm

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The micro stack: weighted entity bundles, synthesis, calibration, and rules-engine adapters for survey microdata

Stars: 0
Forks: 4
Open beginner issues: 0
Indexed issues: 239
Avg merge: 1d 3h
Merged PRs (30d): 94

Dominant language: Python
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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239 open issues indexed

US top-income tail is missing above $5M of AGI: Table 1.1 size-of-AGI facts never bind, and the pool's tail stratum carries capital gains only Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

PolicyEngine/microcosm#958 · 3 comments · Opened Sep 19, 2026
Epic: publish the US default from the graph-native build Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#956 · 1 comment · Opened Sep 18, 2026
UK: supply the engine's local_authority input from the ladder's local_authority_code, plus council tax follow-ups from policyengine-uk#1855/#1864 and uk-data#482/#484 Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#953 · Opened Sep 18, 2026
Pooled prior-year ASEC wages are not aged to the target year Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

PolicyEngine/microcosm#944 · Opened Sep 17, 2026
Calibrate wages by wage band (SSA net compensation or SOI W-2 statistics) Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

PolicyEngine/microcosm#943 · Opened Sep 17, 2026
Carry CPS employer fields and add a jobs imputation stage for employer-side payroll taxes Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

PolicyEngine/microcosm#942 · Opened Sep 17, 2026
State top-tail income mass is uncalibrated: CO M+ AGI at 24% of SOI in buildp-acs-local (fails progressive-bracket scoring) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PolicyEngine/microcosm#940 · Opened Sep 17, 2026
Emit staging telemetry for US exact-K builds Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PolicyEngine/microcosm#933 · Opened Sep 15, 2026
UK graph: move geography assignment ahead of enrichment (geography-first reordering) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#931 · Opened Sep 15, 2026
UK bus fares: impute journeys from NTS microdata so the DfT receipts targets are not level-set by the stage (#890 follow-up) Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

PolicyEngine/microcosm#930 · Opened Sep 15, 2026
Deliver a dense SPM-compatible US successor with verified hours and incumbent comparisons Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

PolicyEngine/microcosm#925 · Opened Sep 14, 2026
County-calibrated County Files (3,144 counties, 2026 + 2027): build epic Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

PolicyEngine/microcosm#922 · Opened Sep 14, 2026
Populate child care attendance inputs in US datasets to avoid CCDF zeros from missing data Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

PolicyEngine/microcosm#915 · Opened Sep 12, 2026
Record per-target calibration estimates during optimization Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

PolicyEngine/microcosm#908 · Opened Sep 11, 2026
Complete UK exact-K release parity and make the runtime country-neutral Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

PolicyEngine/microcosm#898 · Opened Sep 9, 2026
Export CPS parent pointers (PEPAR1/PEPAR2) as person-level parent ids Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

PolicyEngine/microcosm#884 · Opened Sep 7, 2026
Align UK UC claim, child and period definitions Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#882 · 3 comments · Opened Sep 7, 2026
US certified default undercounts households (122.5M) and overcounts married couples (81.5M): no household-type or marital-status targets in the registry Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

PolicyEngine/microcosm#880 · 1 comment · Opened Sep 7, 2026
Benchmark build: carry the disability inputs the references depend on (SSI criterion, SSDI months, permanent-and-total disability) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#876 · Opened Sep 5, 2026
Seed protocol: declare draw_condition for zero-target humanitarian sites Open

Difficulty 3/5 1-2 days Newbie friendliness 63/100

PolicyEngine/microcosm#872 · Opened Sep 4, 2026
UK spine: JSA claimants 2.8× the DWP caseload — legacy-benefit reporting after the UC migration Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PolicyEngine/microcosm#869 · 1 comment · Opened Sep 3, 2026
UK spine: SLC plan-2 borrower stocks at a third of SLC's — the FRS flag captures repayers, not the liable stock Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PolicyEngine/microcosm#868 · Opened Sep 3, 2026
UK spine: housing benefit £2.7bn against OBR £12.1bn — pensioner and supported-accommodation HB missing after the UC migration Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#867 · 1 comment · Opened Sep 3, 2026
UK spine: savings interest income a third under HMRC SPI and five times under the ONS D.41 row — reconcile the target concept and review FRS interest capture Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#866 · Opened Sep 3, 2026
Graph explorer: per-version column table and column lineage walk (variable-level traceability, not just process tracing) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#865 · Opened Sep 3, 2026
Immigration composition gate anchors on a Pew 2022 unauthorized stock that is not the runtime SSN-card residual (c-27 lane F2) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#864 · 1 comment · Opened Sep 3, 2026
Denied-pool reads: single-snapshot or bound-file reads and a non-denied ABA regression Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

PolicyEngine/microcosm#860 · Opened Sep 3, 2026
Require certification and publication tooling to descend from the deny-list merge Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PolicyEngine/microcosm#861 · 1 comment · Opened Sep 3, 2026
Denied-pool identity: version over mandatory relational content, with false-positive tests Open

Difficulty 5/5 Over a week Newbie friendliness 40/100

PolicyEngine/microcosm#859 · Opened Sep 3, 2026
Publish the full schema 7 release contract: country, presentation, publisher_labels, and the generated-never-authored rule Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#858 · Opened Sep 3, 2026
c-26 stacked pool: emergent undocumented population 18.9M vs the 11.0M anchor (1.72x; gate band [0.5, 1.6]) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#856 · 1 comment · Opened Sep 2, 2026
Root identity: every raw microdata input hash-pinned and referenced to its Chronicle registration Open

enhancement tier:standard

Difficulty 5/5 Over a week Newbie friendliness 42/100

PolicyEngine/microcosm#848 · 2 comments · Opened Sep 2, 2026
UK spine: composition-faithful SPI income draw — bridge predictors and rank-preserving replacement (with-children UC residual) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#840 · 3 comments · Opened Sep 2, 2026
Promotion for the constant-id national line: pointer and certified-loader extension Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#823 · 3 comments · Opened Aug 30, 2026
Add the NZ transport contract and real-Axiom Frame bridge Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#820 · Opened Aug 30, 2026
EPIC: populace-am — Armenia: closing the EG DNA macro–micro gap on public data Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#814 · 2 comments · Opened Aug 28, 2026
Harmonize archived-model ACS predictors at pool assembly (end state for the release-side join) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PolicyEngine/microcosm#800 · Opened Aug 27, 2026
WS-E spine deferrals: known bugs and signed inconsistencies awaiting their increment Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

PolicyEngine/microcosm#796 · 2 comments · Opened Aug 27, 2026
By-origin battery design adjudication Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#783 · Opened Aug 26, 2026
Weeks-unemployed eligibility constraint makes its battery incidence band infeasible (max ratio 0.31 vs floor 0.8) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#782 · Opened Aug 26, 2026
By-origin battery Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#781 · Opened Aug 26, 2026
Add the CHIP §71109 reform-coverage probe when the engine encodes it (pe-us#9346) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PolicyEngine/microcosm#778 · Opened Aug 25, 2026
Verification/redetermination churn flag surface (option 2 of #767, generalized) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PolicyEngine/microcosm#777 · Opened Aug 25, 2026
US: store years_since_us_entry from PEINUSYR (blocked on engine ICHIA option) Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

PolicyEngine/microcosm#776 · Opened Aug 25, 2026
US: humanitarian immigration statuses absent from the imputation — H.R.1 §71109/§71302 eligibility channels compute ≈$0 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#767 · 3 comments · Opened Aug 25, 2026
acs-local: weekly_hours_worked_before_lsr defaults to 40, silently nulling SNAP ABAWD analysis Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

PolicyEngine/microcosm#765 · Opened Aug 25, 2026
Evidence publishes refresh the mutable root convenience copies (populace_us_2024.h5 at repo root) — decide whether the evidence tier should skip them Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PolicyEngine/microcosm#753 · Opened Aug 23, 2026
Builder: _ACTIVE_TELEMETRY is never cleared after a completed run, so an early exit in a later in-process main() call marks the PRIOR staging run failed Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

PolicyEngine/microcosm#751 · Opened Aug 23, 2026
Bump PolicyEngine-US from 1.764.6 (generated-variable audit, take-up totality, WIC take-up migration) — prerequisite for #745 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#746 · 1 comment · Opened Aug 22, 2026
Rename the ledger vocabulary to chronicle across the repo Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

PolicyEngine/microcosm#737 · Opened Aug 21, 2026

PolicyEngine/microcosm

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