Imports name this capability’s declared dependencies, which fune builds next to it in your project; each one links to its page.
from .insurance_loss_ratio_types import LossRatios
from .math_round_div import RoundingMode, round_div ← from math.round-div ^1.0.0 · built alongside by fune
from .money_amount import Money, assert_same_currency ← from money.amount ^1.0.0 · built alongside by fune
def loss_ratios(earned_premium: Money, incurred_claims: Money, expenses: Money, mode: RoundingMode) -> LossRatios:
"""Loss, expense and combined ratios against earned premium, in basis points.
The combined ratio is worked from claims plus expenses, rounded once, not
by adding the two rounded ratios, so it can differ from their sum by one
basis point: 1.00 and 1.00 on 3.00 are 33.33% each but 66.67% together.
"""
assert_same_currency(earned_premium, incurred_claims)
assert_same_currency(earned_premium, expenses)
if earned_premium.minor <= 0:
raise ValueError("earnedPremium must be more than zero, received %d" % (earned_premium.minor,))
p = earned_premium.minor
return LossRatios(
loss_ratio_basis_points=round_div(incurred_claims.minor * 10000, p, mode),
expense_ratio_basis_points=round_div(expenses.minor * 10000, p, mode),
combined_ratio_basis_points=round_div((incurred_claims.minor + expenses.minor) * 10000, p, mode),
)