Your input and results


This uses the function getCIaroundSD() going into my CECPfuns R package. It's based on the excellent page at: and cross-checked with

This assumes Gaussian population distribution. There are bootstrap ways to get a robust CI for the SD for non-Gaussian distributions in various R packages. I may add an app for them later.

This is a bit of a niche CI but it's important when thinking about the RCI (Reliable Change Index)

App created by Chris Evans licenced under a Creative Commons, Attribution Licence-ShareAlike Please respect that and put an acknowledgement and link back to here if re-using anything from here.

Background and related resources

This shiny app is one of a growing number in, my shiny server
They complement:

There is a form if you want to contact me: so do please use that if you think there is anything wrong here or anything that could be improved.

There is also now an Email announcement list, never updating more than monthly, where I will put up developments of new apps here, a summary of updates to the glossary and new posts in the Rblog. You can sign up for that here.