micEcon (version 0.1-3)

aidsPx: Price Index for the AIDS

Description

Calculate log price indices for the AIDS and LA-AIDS.

Usage

aidsPx( px, pNames, wNames = NULL, data = NULL, base = 1, coef = NULL,
      alpha0 = ifelse( is.null( coef$alpha0 ), 0, coef$alpha0 ) )

Arguments

px

the prices index to be used (see details).

pNames

a vector of strings containing the names of prices.

wNames

a vector of strings containing the names of expenditure shares.

data

a data frame containing the data.

base

The base to calculate the indices (see details).

coef

a list containing the coefficients alpha, beta and gamma (only needed for the translog price index).

alpha0

coefficient $\alpha_0$ in the translog price index.

Value

• a vector containing the log price index.

Details

Currently 6 different price indices are implemented: * translog price index ('TL'), * Stone price index ('S'), * Stone price index with lagged shares ('SL'), * loglinear analogue to the Paasche price index ('P'), * loglinear analogue of the Laspeyres price index ('L'), and * Tornqvist price index ('T'). The argument base can be either (a) a single number: the row number of the base prices and quantities, (b) a vector indicating several observations: The means of these observations are used as base prices and quantities, or (c) a logical vector with the same length as the data: The means of the observations indicated as 'TRUE' are used as base prices and quantities.

References

Deaton, A.S. and J. Muellbauer (1980) An Almost Ideal Demand System. American Economic Review, 70, p. 312-326.

Moschini, G. (1995) Units of Measurement and the Stone Index in Demand System Estimation. American Journal of Agricultural Economics, 77, p. 63-68.

See Also

aidsEst

Examples

data( Blanciforti86 )
   aidsPx( "S", c( "pFood1", "pFood2", "pFood3", "pFood4" ),
      c( "wFood1", "wFood2", "wFood3", "wFood4" ), Blanciforti86 )