This is a helper function that describes the analysis in s_proportion().
Arguments
- conf_level
 (
proportion)
confidence level of the interval.- method
 (
string)
the method used to construct the confidence interval for proportion of successful outcomes; one ofwaldcc,wald,clopper-pearson,wilson,wilsonc,strat_wilson,strat_wilsonc,agresti-coullorjeffreys.- long
 (
flag)
whether a long or a short (default) description is required.
