translogCalc: Calculate dependent variable of a translog function

In micEcon: Microeconomic Analysis and Modelling

Description

Calculate the dependent variable of a translog function.

Usage

translogCalc( xNames, data, coef, shifterNames = NULL,
   dataLogged = FALSE  )

Arguments

xNames	a vector of strings containing the names of the independent variables.
data	dataframe containing the data.
coef	vector containing all coefficients: if there are n exogenous variables in xNames and m shifter variables in shifterNames, the n+1 alpha coefficients must have names a_0, ..., a_n, the n*(n+1)/2 beta coefficients must have names b_1_1, ..., b_1_n, ..., b_n_n, and the m delta coefficients must have names d_1, ..., d_m (only the elements of the upper right triangle of the beta matrix are directly obtained from coef; the elements of the lower left triangle are obtained by assuming symmetry of the beta matrix).
shifterNames	a vector of strings containing the names of the independent variables that should be included as shifters only (not in quadratic or interaction terms).
dataLogged	logical. Are the values in data already logged?

Value

A vector containing the endogenous variable. If the inputs are provided as logarithmic values (argument dataLogged is TRUE), the endogenous variable is returned as logarithm; non-logarithmic values are returned otherwise.

Author(s)

Arne Henningsen

See Also

translogEst and translogDeriv.

Examples

   data( germanFarms )
   # output quantity:
   germanFarms$qOutput <- germanFarms$vOutput / germanFarms$pOutput
   # quantity of variable inputs
   germanFarms$qVarInput <- germanFarms$vVarInput / germanFarms$pVarInput
   # a time trend to account for technical progress:
   germanFarms$time <- c(1:20)

   # estimate a Translog production function
   estResult <- translogEst( "qOutput", c( "qLabor", "land", "qVarInput", "time" ),
      germanFarms )

   translogCalc( c( "qLabor", "land", "qVarInput", "time" ), germanFarms,
      coef( estResult ) )
   #equal to estResult$fitted

Example output

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        1         2         3         4         5         6         7         8 
 943.9667  975.9852 1060.6385 1145.4517 1188.1554 1206.2718 1236.5526 1292.7237 
        9        10        11        12        13        14        15        16 
1196.9841 1281.0442 1362.2633 1542.6942 1575.6501 1699.6713 1632.7159 1618.6759 
       17        18        19        20 
1678.3680 1741.8183 1887.9169 1992.8400 

micEcon documentation built on Jan. 7, 2021, 3:01 p.m.