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| RE: frontier - Battese and Coelli (1992) [ Reply ] By: Arne Henningsen on 2014-10-17 20:43 | [forum:41544] |
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Dear Graziella You can set argument "timeEffect" qual to "TRUE" (see documentation of function sfa()). Best regards, Arne |
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| frontier - Battese and Coelli (1992) [ Reply ] By: Graziella Bonanno on 2014-10-17 14:58 | [forum:41543] |
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Hello, I need to estimate a cost frontier on a sample of panel data as proposed by Battese and Coelli (1992), without zeta variables (explicative of the inefficiency). After, I need to obtain the Cost Efficiency Scores. R can report only the component u_i (time inveriant), but I need to achieve u_it = u_i * eta_it = u_i*exp(-eta*(t-T)) , where eta is a parameter to be estimated. Is there a way to obtain from R u_it or eta? Is there someone that can help me please? Thank you very much, Graziella |
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