initial commit, draft

lib/reliability.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+import numpy as _np
+
+C_YEARS_TO_BLN_HOURS = (365.24 * 24) / 1_000_000_000
+
+def to_fits(reliability, time_yrs=5):
+    time_hrs = time_yrs*C_YEARS_TO_BLN_HOURS
+    return _np.log(reliability)/-time_hrs
+
+def to_rel(FITs, time_yrs=5):
+    time_hrs = time_yrs*C_YEARS_TO_BLN_HOURS
+    return _np.exp(-time_hrs * FITs)
+
+def to_urel(FITs, time_yrs=5):
+    time_hrs = time_yrs*C_YEARS_TO_BLN_HOURS
+    return 1-_np.exp(-time_hrs * FITs)
+
+from_fits=to_rel
+from_rel=to_fits