'Plot the estimated survival curves. After using this method
do
plt.show()
to display the plot'

def plot(self):

    plt.figure()
    if (self.exog == None):
        self.plotting_proc(0)
    else:
        for g in range(len(self.groups)):
            self.plotting_proc(g)
    plt.ylim(ymax=1.05)
    plt.ylabel('Survival')
    plt.xlabel('Time')
