Currently implemented only two low-quality methods: Z-test pooled and Z-test unpooled. Miettinen and Nurminen’s Likelihood Score Test was implemented, but likely in a wrong way.
Description of the R library "Exact" has some references to scientific publications that describe alternative methods for CI for the difference between two proportions. https://cran.r-project.org/web/packages/Exact/index.html
Add toolkit for studying CI methods for other statistics as well, such as mean, standard deviation, etc.