Stochastic Frontier Analysis - Methodology - আরবিআই - Reserve Bank of India
Stochastic Frontier Analysis - Methodology
Following the standard stochastic frontier model for cross section analysis (Aigner et al., 1977) later extended to panel data (Battese and Coelli, 1995), let where Yit denotes own tax revenue (OTR)/ taxes on commodities and services (TaxCom), Xit denotes vector of inputs (viz., Log Per capita GSDP, Square of Log Per capita GSDP and Log share of Agriculture in GSDP) affecting tax revenue for the i th state in the t th period and β is a vector of unknown parameters. Error component is decomposed into two parts vit and uit; vit is statistical noise term with symmetric distribution while uit is a non-negative error component representing the time varying technical inefficiency. The inefficiency effects are expressed as an explicit function of state-specific variables and a random error to identify the reasons for differences in predicted efficiencies between states as given below where Wit is a random variable defined by truncation of normal distribution with zero mean and variance σ2 and Zit denotes vector of variables predicting inefficiency (viz., Ratio of transfers in revenue receipts, Aggregate Expenditure to GSDP, Debt-GSDP ratio and VAT Dummy). The estimates of efficiency can be derived once the point estimates of uit are obtained by the following expression;
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