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  • SUREG IZEF with constraints

    I'm trying to estimate a system of equations concerning translog cost function and share equations, through IZEF using the sureg command. I have to impose symmetry and linear homogeneity in prices.
    Unfortunately, once I impose the constraints, I get peculiar output, whereby some of the coefficients are omitted. The constraints also feature a strange 'o' when they appear in the output, for example:

    ( 2) [lnac].olnpe_a - [se]o._cons = 0
    ( 3) [lnac]o.lnpl_a - [sl]o._cons = 0

    How can I modify the constraints so as to rectify this problem?
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