Tuossapas se Grey-Hen Oy:n paska "salainen" menetelmä jolla ne verot arvottiin tuontiautoihin.
Tuo menetelmä on täysi Susi erlingiä lainatakseni. Ei kummakaan ettei tulli halunnut KHO:ssa paljastaa mihin kyseiset Grey-Hen hinnat perustuvat. Onneksi KHO ei mennyt ansaan. Noistahan näkee sokea Reettakin, että täyssä paskaa ja huuhaata moiset kaavat ja indeksit ovat.
( lähde http://www.unece.org/stats/documents/ces/ac.49/1997/wp.2.e.pdf )
1.3 Hedonic methods currently applied in the Finnish CPI
1.3.1 Hedonic method for old cars
Hedonic approach was first adopted in the measurement of old cars. The method
has been described in the work of HICP Study Group: Vehicles ( Vartia [University of Helsinki] and Halonen [Autodata]: Price Measurement of Second Hand Cars currently applied in the Finnish CPI, Study Group Paper presented in Helsinki, February 1997). The actual price collection and modelling is done in a company Autodata and the CPI uses every month one index number as an input to the CPI system.
Autodata's index is based on asking prices obtained directly from car dealers and the material covers approximately 90-100% of all second hand cars traded through car dealers in Finland. The index is constructed with 70 regression equations where the log-asking price is explained with:
-age of the car
-mileage
-its price as new
-time dummies for 5 preceding months
-minor corrections for differences in different areas
The index is based on 70 most popular car models. The models give quality adjusted prices also for their subtypes (which differ only in relation to prices as new, all other coefficients are the same for all sub-types of the same model).
Based on hedonic regression calculated at standardised quality point a weighted
Laspeyres index is constructed using monthly chaining. Statistics Finland is fortunate to have fruitful co-operation with the company Autodata which enables us to have very detailed approach to hedonic modelling.
But even with lesser data the same approach would be valid which in fact has been recommended by Eurostat´s Study Group (Progress Report of the Vehicles Study Group HICP 97/145, Luxemburg June 1997) as one possible option for old carmeasurement . What is important is the use of standard quality points (Vartia [University of Helsinki] and -Halonen [Autodata]: Sensitivity Analysis Conserning Standard Quality Points. Study Group Paper in Luxemburg. April 1997) and hedonic imputation.
1.3.2 Hedonic modelling for new cars
For new cars hedonic approach was also planned but finally a much easier and simpler method was developed (Vartia [University of Helsinki]: Quality Differences and Prices of New Cars: Price per Quality Unit Approach, Study Group Paper presented in Helsinki, February 1997). This method based on relatively simple hedonic models was reduced to expressing the price of a car in relation to its size and power. This is argued to capture the effect of "real technical" quality change (improvement) in time together with proper sampling strategy (Vartia [University of Helsinki]: Item Selection, Quality Change and Grouping in the CPI: the Case of Cars, Study Group Paper presented in Luxembourg, April 1997). What in practice is experienced as a big problem (options becoming standard) can as an intermediary solution be solved with option cost method. This means, that when air conditioning becomes part of a standard model the resulting price increase can be adjusted for example by using half the price of air conditioning when it was optional. A more elegant way would be to use hedonic technique for adjusting for quality but care should be taken not to overadjust. Many new features of a car may namely correlate with size and power. How this method works in practice will be tested in the Finnish CPI starting in December 1997.
Tuo menetelmä on täysi Susi erlingiä lainatakseni. Ei kummakaan ettei tulli halunnut KHO:ssa paljastaa mihin kyseiset Grey-Hen hinnat perustuvat. Onneksi KHO ei mennyt ansaan. Noistahan näkee sokea Reettakin, että täyssä paskaa ja huuhaata moiset kaavat ja indeksit ovat.
( lähde http://www.unece.org/stats/documents/ces/ac.49/1997/wp.2.e.pdf )
1.3 Hedonic methods currently applied in the Finnish CPI
1.3.1 Hedonic method for old cars
Hedonic approach was first adopted in the measurement of old cars. The method
has been described in the work of HICP Study Group: Vehicles ( Vartia [University of Helsinki] and Halonen [Autodata]: Price Measurement of Second Hand Cars currently applied in the Finnish CPI, Study Group Paper presented in Helsinki, February 1997). The actual price collection and modelling is done in a company Autodata and the CPI uses every month one index number as an input to the CPI system.
Autodata's index is based on asking prices obtained directly from car dealers and the material covers approximately 90-100% of all second hand cars traded through car dealers in Finland. The index is constructed with 70 regression equations where the log-asking price is explained with:
-age of the car
-mileage
-its price as new
-time dummies for 5 preceding months
-minor corrections for differences in different areas
The index is based on 70 most popular car models. The models give quality adjusted prices also for their subtypes (which differ only in relation to prices as new, all other coefficients are the same for all sub-types of the same model).
Based on hedonic regression calculated at standardised quality point a weighted
Laspeyres index is constructed using monthly chaining. Statistics Finland is fortunate to have fruitful co-operation with the company Autodata which enables us to have very detailed approach to hedonic modelling.
But even with lesser data the same approach would be valid which in fact has been recommended by Eurostat´s Study Group (Progress Report of the Vehicles Study Group HICP 97/145, Luxemburg June 1997) as one possible option for old carmeasurement . What is important is the use of standard quality points (Vartia [University of Helsinki] and -Halonen [Autodata]: Sensitivity Analysis Conserning Standard Quality Points. Study Group Paper in Luxemburg. April 1997) and hedonic imputation.
1.3.2 Hedonic modelling for new cars
For new cars hedonic approach was also planned but finally a much easier and simpler method was developed (Vartia [University of Helsinki]: Quality Differences and Prices of New Cars: Price per Quality Unit Approach, Study Group Paper presented in Helsinki, February 1997). This method based on relatively simple hedonic models was reduced to expressing the price of a car in relation to its size and power. This is argued to capture the effect of "real technical" quality change (improvement) in time together with proper sampling strategy (Vartia [University of Helsinki]: Item Selection, Quality Change and Grouping in the CPI: the Case of Cars, Study Group Paper presented in Luxembourg, April 1997). What in practice is experienced as a big problem (options becoming standard) can as an intermediary solution be solved with option cost method. This means, that when air conditioning becomes part of a standard model the resulting price increase can be adjusted for example by using half the price of air conditioning when it was optional. A more elegant way would be to use hedonic technique for adjusting for quality but care should be taken not to overadjust. Many new features of a car may namely correlate with size and power. How this method works in practice will be tested in the Finnish CPI starting in December 1997.
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