Fix typo in kaplan_meier_fitter.py
@@ -132,7 +132,7 @@ class KaplanMeierFitter(UnivariateFitter):
) -> "KaplanMeierFitter":
"""
Fit the model to a interval-censored dataset using non-parametric MLE. This estimator is
- also called the Turball Estimator.
+ also called the Turnbull Estimator.
Currently, only closed interval are supported. However, it's easy to create open intervals by adding (or subtracting) a very small
value from the lower-bound (or upper bound). For example, the following turns closed intervals into open intervals.
