codes for back calculation method

[muriuki]

am doing some project that requires the use of back-calculation method as used in the study of AIDS as described by Brookmeyer and Gail.
the hitch is am having rough time coming up with the necessary codes. it may include the matrix version of the same .
i will appreciate

[andresrcs]

What is your specific problem?, we are more inclined towards helping you with specific coding problems rather than searching the web for a paper.

Could you please turn this into a self-contained REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

If you've never heard of a reprex before, you might want to start by reading this FAQ:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…