UNIRRUnião e Inclusão em Redes de Rádio (Portuguese: Union and Inclusion in Network Radio; Brazil)
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To account for zero observations in the Cobb-Douglas functional form, the following procedure is adopted: in Equation 10, the UNIRR variable is transformed into log form when UNIRR>0, while zero's are taken as such, and an additional variable is [D.sub.un] is created assuming value of I when the UNIRR is equal to zero and takes zero value if the UNIRR is positive [Battese et al.