forgot a negative sign
@@ -181,7 +181,7 @@ equation!), we get:
The integral has a more common name: the *cumulative hazard function*, denoted :math:`H(t)`. We can rewrite the above as:
-.. math:: S(t) = \exp\left( H(t) \right)
+.. math:: S(t) = \exp\left(-H(t) \right)
What I love about the above equation is that it defines **all** survival
