IRRCalc

Incident Rate Ratio Calculator Tony Gojanovic

Background

This simple calcultor computes the ratio of two incident rates (r1/r2) along with a 95% confidence interals. Specifically, calculating the following quantities:

IRR = (cases_post_intervention/time_post_intervention) / (cases_pre_intervention/time_pre_intervention)

CI = exp(ln(IRR) +/- 1.96*sqrt(1/cases_pre_intervention + 1/cases_post_intervention))

So, IRR is Incident Rate Ratio and in the abouve, caes pre and post are measured in "person years" but other types of standardizing factors may be used as well.

Create an Example Package in R

Package: IRRCalc
GitHub: https://github.com/cowboy2718/IRRCalc

Data Source

Data for this calculator is input by the user.

Travis Badge

The following indicates the status of the most recent build with Travis:

References

Algoritms based on Algorithm based on "Comparing two incident rate ratios,” https://stats.stackexchange.com/questions/297994/comparing-two-incidence-rate-ratios

Useful Links in the Development of this Package:

The following were very useful links used in the development of this project.

• Building R Packages in R Studio, John Muschelli
• Putting your R Package on Github, Karl Broman
• RStudio & Github Integration, James Dayhuff
• Creating RStudio projects from GitHub Repositories, Nicholas Reich
• Developing R Packages | Part 7: Unit Testing, Colin Pistell
• Travis CI Tutorial - How to Use Travis CI with Github for Continuous Integration, Full Stack Academy