R package for maximum likelihood estimation of two-tier stochastic frontier models.
At this moment, one specification is available - the composed error specification with three components: symmetric (normal), positive (exponential) and negative (exponential), as described in: Kumbhakar, S. C., & Parmeter, C. F. (2009). The effects of match uncertainty and bargaining on labor market outcomes: evidence from firm and worker specific estimates. Journal of Productivity Analysis, 31(1), 1-14, 10.1007/s11123-008-0117-3
To install directly from GitHub:
library(devtools)
devtools::install_github("kaftanowicz/ttfrontier")