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...imited experience on R and recently started using REXcel. Although I have been able to run both simple functions (like mean etc) and some complex ones (like Principal Component analysis, PCA) using RExcel, I am facing some problems while running EGARCH model. For this I have downloaded the 'betategarch' package for R to run EGARCH with student t dist. Although the package has been installed properly, whenever I run function, I get an error saying - "could not find function "tegarch.est". I'd appreciate any help on the above. Regards Ank [[alternative HTML version dele...