Wire up input for an optional mitigation effective date

Author: PhilMiller

src/penn_chime/parameters.py

@@ -55,6 +55,7 @@ def __init__(
         hospitalized: Disposition,
         icu: Disposition,
         relative_contact_rate: float,
+        mitigation_date: Optional[date] = None,
         ventilated: Disposition,
         current_date: date = date.today(),
         date_first_hospitalized: Optional[date] = None,
@@ -68,7 +69,6 @@ def __init__(
         region: Optional[Regions] = None,
     ):
         self.current_hospitalized = StrictlyPositive(value=current_hospitalized)
-        self.relative_contact_rate = Rate(value=relative_contact_rate)
 
         Rate(value=hospitalized.rate), Rate(value=icu.rate), Rate(value=ventilated.rate)
         StrictlyPositive(value=hospitalized.days), StrictlyPositive(value=icu.days),
@@ -92,6 +92,9 @@ def __init__(
         self.date_first_hospitalized = OptionalDate(value=date_first_hospitalized)
         self.doubling_time = OptionalStrictlyPositive(value=doubling_time)
 
+        self.relative_contact_rate = Rate(value=relative_contact_rate)
+        self.mitigation_date = OptionalDate(value=mitigation_date)
+
         self.infectious_days = StrictlyPositive(value=infectious_days)
         self.market_share = Rate(value=market_share)
         self.max_y_axis = OptionalStrictlyPositive(value=max_y_axis)

src/penn_chime/presentation.py

@@ -204,6 +204,10 @@ def display_sidebar(st, d: Parameters) -> Parameters:
         st_obj, "Date of first hospitalized case - Enter this date to have chime estimate the initial doubling time",
         value=d.date_first_hospitalized,
     )
+    mitigation_date_input = DateInput(
+        st_obj, "Date of social distancing measures effect (may be delayed from implementation)",
+        value=d.mitigation_date
+    )
     relative_contact_pct_input = PercentInput(
         st_obj,
         "Social distancing (% reduction in social contact going forward)",
@@ -309,7 +313,14 @@ def display_sidebar(st, d: Parameters) -> Parameters:
         doubling_time = doubling_time_input()
         date_first_hospitalized = None
 
-    relative_contact_rate = relative_contact_pct_input()
+    if st.sidebar.checkbox(
+        "Social distancing measures have been implemented"
+    ):
+        mitigation_date = mitigation_date_input()
+        relative_contact_rate = relative_contact_pct_input()
+    else:
+        mitigation_date = None
+        relative_contact_rate = 1.e-7
 
     st.sidebar.markdown(
         "### Severity Parameters [ℹ]({docs_url}/what-is-chime/parameters#severity-parameters)".format(