Maintain defaults of social distancing, and ensure they're displayed accordingly

Author: PhilMiller

src/penn_chime/presentation.py

@@ -11,6 +11,7 @@
     CHANGE_DATE,
     DATE_FORMAT,
     DOCS_URL,
+    EPSILON,
     FLOAT_INPUT_MIN,
     FLOAT_INPUT_STEP,
 )
@@ -314,13 +315,14 @@ def display_sidebar(st, d: Parameters) -> Parameters:
         date_first_hospitalized = None
 
     if st.sidebar.checkbox(
-        "Social distancing measures have been implemented"
+        "Social distancing measures have been implemented",
+        value=(d.relative_contact_rate > EPSILON)
     ):
         mitigation_date = mitigation_date_input()
         relative_contact_rate = relative_contact_pct_input()
     else:
         mitigation_date = None
-        relative_contact_rate = 1.e-7
+        relative_contact_rate = EPSILON
 
     st.sidebar.markdown(
         "### Severity Parameters [ℹ]({docs_url}/what-is-chime/parameters#severity-parameters)".format(

src/penn_chime/settings.py

@@ -16,6 +16,7 @@ def get_defaults():
         infectious_days=14,
         market_share=0.15,
         n_days=100,
+        mitigation_date=date.today(),
         relative_contact_rate=0.3,
         ventilated=Disposition(0.005, 10),
     )