sma_init() can now be used to load all libraries and the data.
It is safe to call sma_init() multiple times. To forcefully reload the
data call sma_init_force().
This will create the plot using the ggsurvplot from "survminer" package.
survminer user ggplot for plotting and comes with some powerful and nice
looking features.
Each plot has now its own function. This makes it easier to adjust the
creation and tweaking of a single plot. sma_plot_file() will now call
the individual plot function before saveing the plot.
The base data was changed from month to years for more precision.
Therefor the scaling of the graphs must be adjusted to days per year
instead of month per year.
