FEATURE: binomial standard error function

[krpaulson]

Is your feature request related to a problem? Please describe.
Not related to a problem.

Describe the solution you'd like
Add a helper function or multiple functions to assist with estimating standard error assuming a binomial distribution.

Describe alternatives you've considered
We could instead add clear documentation of how you would do this using a few lines from other packages (possibly in a wiki with other examples like this).

Additional context
None.