Move all stochastic randomness to data package for deterministic country package

changelog_entry.yaml

@@ -0,0 +1,16 @@
+- bump: minor
+  changes:
+    added:
+      - Section 1931 deprivation requirement parameter for non-expansion states
+      - is_single_parent_household variable for Medicaid deprivation rules
+      - Head Start and Early Head Start takeup variables
+      - SSI resource test now uses actual policy logic in individual sim
+    changed:
+      - Moved all stochastic randomness to data package for deterministic country package
+      - is_parent_for_medicaid_nfc now checks Section 1931 deprivation requirements
+      - Head Start and Early Head Start benefits now multiply by takeup
+      - WIC would_claim_wic and is_wic_at_nutritional_risk default to True (resolved in data package)
+    removed:
+      - aca_take_up_seed, snap_take_up_seed, medicaid_take_up_seed variables
+      - random() calls from all variable formulas
+      - Takeup rate parameters (now in policyengine-us-data)

policyengine_us/parameters/gov/hhs/medicaid/eligibility/categories/parent/requires_deprivation.yaml

@@ -0,0 +1,122 @@
+description: >
+  Whether the state requires a child to be "deprived of parental support"
+  for parent Medicaid eligibility. This is based on Section 1931 criteria
+  which applies to non-expansion states using pre-ACA AFDC rules.
+  In practice, this means two-parent households generally do not qualify
+  unless one parent is incapacitated or unemployed.
+metadata:
+  label: Medicaid parent eligibility requires deprivation
+  unit: bool
+  period: year
+  breakdown:
+    - state_code
+  reference:
+    - title: Section 1931 Medicaid Eligibility
+      href: https://www.law.cornell.edu/uscode/text/42/1396u-1
+    - title: KFF - Medicaid Eligibility for Parents
+      href: https://www.kff.org/medicaid/state-indicator/medicaid-income-eligibility-limits-for-parents/
+# Non-expansion states that use Section 1931 deprivation rules
+AL:
+  2018-01-01: true
+FL:
+  2018-01-01: true
+GA:
+  2018-01-01: true
+KS:
+  2018-01-01: true
+MS:
+  2018-01-01: true
+NC:
+  2018-01-01: true
+  2023-12-01: false  # NC expanded Medicaid
+SC:
+  2018-01-01: true
+SD:
+  2018-01-01: true
+TN:
+  2018-01-01: true
+TX:
+  2018-01-01: true
+WI:
+  2018-01-01: true
+WY:
+  2018-01-01: true
+# Expansion states - no deprivation requirement
+AK:
+  2018-01-01: false
+AR:
+  2018-01-01: false
+AZ:
+  2018-01-01: false
+CA:
+  2018-01-01: false
+CO:
+  2018-01-01: false
+CT:
+  2018-01-01: false
+DC:
+  2018-01-01: false
+DE:
+  2018-01-01: false
+HI:
+  2018-01-01: false
+IA:
+  2018-01-01: false
+ID:
+  2018-01-01: false
+IL:
+  2018-01-01: false
+IN:
+  2018-01-01: false
+KY:
+  2018-01-01: false
+LA:
+  2018-01-01: false
+MA:
+  2018-01-01: false
+MD:
+  2018-01-01: false
+ME:
+  2018-01-01: false
+MI:
+  2018-01-01: false
+MN:
+  2018-01-01: false
+MO:
+  2018-01-01: false
+MT:
+  2018-01-01: false
+ND:
+  2018-01-01: false
+NE:
+  2018-01-01: false
+NH:
+  2018-01-01: false
+NJ:
+  2018-01-01: false
+NM:
+  2018-01-01: false
+NV:
+  2018-01-01: false
+NY:
+  2018-01-01: false
+OH:
+  2018-01-01: false
+OK:
+  2018-01-01: false
+OR:
+  2018-01-01: false
+PA:
+  2018-01-01: false
+RI:
+  2018-01-01: false
+UT:
+  2018-01-01: false
+VA:
+  2018-01-01: false
+VT:
+  2018-01-01: false
+WA:
+  2018-01-01: false
+WV:
+  2018-01-01: false

policyengine_us/tests/policy/baseline/gov/hhs/head_start/early_head_start.yaml

@@ -15,3 +15,13 @@
     is_early_head_start_eligible: false
   output:
     early_head_start: 0
+
+- name: Case 3, eligible but does not take up early head start.
+  period: 2022
+  absolute_error_margin: 0.5
+  input:
+    state_code: CA
+    is_early_head_start_eligible: true
+    takes_up_early_head_start_if_eligible: false
+  output:
+    early_head_start: 0

policyengine_us/tests/policy/baseline/gov/hhs/head_start/head_start.yaml

@@ -15,3 +15,13 @@
     is_head_start_eligible: false
   output:
     head_start: 0
+
+- name: Case 3, eligible but does not take up head start.
+  period: 2022
+  absolute_error_margin: 0.5
+  input:
+    state_code: CA
+    is_head_start_eligible: true
+    takes_up_head_start_if_eligible: false
+  output:
+    head_start: 0

policyengine_us/tests/policy/baseline/gov/usda/wic/is_wic_at_nutritional_risk.yaml

@@ -1,28 +1,27 @@
-# Nutritional risk is a health assessment per 42 U.S.C. § 1786(b)(8).
-# In individual simulation, all persons are assumed at nutritional risk.
-# In microsimulation, risk is assigned probabilistically by category.
+# Nutritional risk is resolved in the data package for microsimulation.
+# In individual simulation, default_value = True so all persons are assumed
+# at nutritional risk. NONE-category adults still get True, but is_wic_eligible
+# gates on demographic eligibility (category != NONE), so it's benign.
 
-- name: Case 1, infant assumed at nutritional risk in individual simulation.
+- name: Case 1, infant at nutritional risk (default True).
   period: 2024-01
   input:
     age: 0
   output:
     is_wic_at_nutritional_risk: true
 
-- name: Case 2, child assumed at nutritional risk in individual simulation.
+- name: Case 2, child at nutritional risk (default True).
   period: 2024-01
   input:
     age: 3
   output:
     is_wic_at_nutritional_risk: true
 
-- name: Case 3, adult assumed at nutritional risk in individual simulation.
+- name: Case 3, non-WIC adult (default True, benign — gated by is_wic_eligible).
   period: 2024-01
   input:
     age: 35
   output:
-    # Even adults are assumed at nutritional risk in individual simulation.
-    # Demographic eligibility is checked separately in is_wic_eligible.
     is_wic_at_nutritional_risk: true
 
 - name: Case 4, person receiving WIC is at nutritional risk.