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  • asymmetric loss function

    Dear All,

    This is my first time on this platform. I have one question that I would like assistance from you. I am currently working on a topic, which aims at evaluating whether forecasts of government revenue are optimal. I am using the theoretical framework developed by Elliot, Komunjer, and Timmermann (2005) regarding the asymetric loss function. To cut the long story short, I came up with this equation:
    E[w(forecast error-(1-2a)|forecast error|)]=0, which is equal to forecast error=(1-2a)|forecast error|+bw+error
    I want to use the generalised method of moments to estimate a. Now here is my question how must deal with (1-2a) in the equation when inputing in stata? Your assistance is much appreciated.

    Kind regards,
    Clement
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