We introduce three new commands|nop, ziop2, and ziop3|for the estimation of a three-part nested ordered probit model, the two-part zero inflated ordered probit models of Harris and Zhao (2007, Journal
We examine two economic aspects of aviation used for wildland firefighting in the United States. First, we analyze the procurement of aviation resources by federal agencies, and how the structure of c
" HHI-DCB Seasons UEFA&CONMEBOL" shows the HHI and DCB values calculated for the different leagues of the UEFA and CONMEBOL Federations, for the 2009/10 to 2018/19 seasons. "DCB means and variance