micEcon (version 0.4-0)

translogEst: Estimate a translog function

Description

Estimate a translog function.

Usage

translogEst( yName, xNames, data, quadHalf = TRUE, logValues = FALSE )

Arguments

yName

a string containing the name of the dependent variable.

xNames

a vector of strings containing the names of the independent variables.

data

dataframe containing the data.

quadHalf

logical. Multiply the quadratic terms by one half?

logValues

logical. Are the values in data already logged?

Value

• a list of class translogEst containing following objects:
• lm
  a list returned by lm.
• residuals
  residuals.
• fitted
  fitted values.
• coef
  a list containing the the estimated coefficients: alpha0 = $\alpha_0$ (scalar), alpha = $\alpha_i$ (vector), beta = $\beta_ij$ (matrix).
• allCoef
  vector of all coefficients.
• allCoefCov
  Covariance matrix of all coefficients.
• r2
  $R^2$ value.
• r2bar
  adjusted $R^2$ value.
• nObs
  number of observations.
• model.matrix
  the model matrix.

See Also

translogCalc, translogDeriv and quadFuncEst.

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 quadratic production function
   estResult <- translogEst( "qOutput", c( "qLabor", "land", "qVarInput", "time" ),
      germanFarms )

   estResult$coef
   estResult$r2