**1. ****Exact
confidence intervals for the difference of two proportions p _{1}-p_{2}:**

**An R package for Window, ExactCIdiff, is provided to compute i)
lower one-sided confidence interval, ii) upper one-sided confidence interval,
iii) two-sided confidence interval, when the data are collected from a matched
pair experiment or two independent binomial experiments. The intervals are
exactly of level 1-α. See examples.pdf
for details. This package for Mac is available at: **

**http://cran.r-project.org/web/packages/ExactCIdiff/index.html **

** **