Hello everyone, I'm trying to estimate efficiency terms using the translog cobb douglas production function using the command xtfrontier for a panel of countries to measure the efficiency of production for each country. However when i predict the efficiency term I get some countries that are medium income with high efficiency score, countries like Sudan and Egypte and Nigeria. Can someone please explain this and how can I make it predict correct efficiency terms.
PS: i'm using the penn world table data 9th version
PS: i'm using the penn world table data 9th version
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