For the last year I have been developing a package “Lambda4” to improve internal consistency reliability estimation. In the package’s conception my primary concern centered on H.G. Osburn’s maximized lambda4 estimator. Despite a very thorough search I could not find a stats package that could utilized Osburn’s method. I wanted to learn R and so I jumped in and tried to make the function. The original function has changed dramatically as I learned methods to speed up the code and tweaks to the original method that improved the precision of the estimator. That function is now called cov.lambda4() and provides a modern perspective on reliability estimation. The package is slowly developing into a set of function that I have developed as well as a collection of some of the classics and forgotten estimators of internal consistency reliability. A major update is on the way that will include all 6 of Guttman’s lambdas, and a couple of other relatively unknown estimators. Follow the blog if you want to hear more about the specific functions in the package. I will be adding posts for each of them. If you want to download the package you can use the code in R.
for further documentation go here
If you have any ideas or comments please post them.