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Correct is_parent variable #1098

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Correct is_parent variable #1098

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9 changes: 3 additions & 6 deletions policyengine_uk/variables/household/demographic/is_parent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,22 +14,19 @@ def formula(person, period, parameters):

# Find two oldest members
benunit_ages = benunit.members("age", period)
first_highest = benunit.max(benunit_ages)
second_highest = benunit.max(
where(benunit_ages < first_highest, benunit_ages, -np.inf)
)
adult_index = person("adult_index", period)

# Get family types enum
family_types = family_type.possible_values

# For lone parents (FamilyType.LONE_PARENT), only the eldest is parent
is_lone_parent = (family_type == family_types.LONE_PARENT) & (
age == first_highest
adult_index == 1
)

# For couples with children (FamilyType.COUPLE_WITH_CHILDREN), two eldest are parents
is_couple_parent = (
family_type == family_types.COUPLE_WITH_CHILDREN
) & ((age == first_highest) | (age == second_highest))
) & ((adult_index == 1) | (adult_index == 2))

return is_lone_parent | is_couple_parent