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Table A16. World reference prices: results of the unit root tests (monthly data)




ADF
coefficient (-1)

PP
coefficient (-1)

WRWHRP

level

-0.04

-0.02



-3.54

-2.05


first differences


-0.72




-14.65

WRMZRP

level

-0.04

-0.02



-3.06

-2.33


first differences

-0.76

-0.67



-5.01

-13.96

WRSHRP

level

-0.04

-0.03



-3.11

-2.72


first differences

-0.88

-0.74



-4.84

-15.02

WRRIRP

level

-0.04

-0.03



-2.40

-1.74


first differences

-0.91

-0.73



-4.50

-12.26

WRCSRP

level

-0.06

-0.04



-3.35

-2.95


first differences

-0.77

-0.82



-4.38

-14.33

WRSYRP

level

-0.07

-0.05



-3.11

-2.59


first differences

-0.88

-0.71



-4.25

-12.01

WRSFRP

level

-0.10

-0.08



-3.11

-2.92


first differences

-1.05

-0.73



-6.30

-8.83

WRCPRP

level

-0.05

-0.03



-3.12

-2.02


first differences

-0.73

-0.90



-5.94

-14.66

WRPORP

level

-0.07

-0.06



-2.51

-2.30


first differences

-1.07

-1.28



-3.78

-20.53

WRBMRP

level

-0.04

-0.04



-2.09

-2.24


first differences

-0.99

-0.80



-3.62

-12.50

WRPMRP

level

-0.17

-0.12



-1.80

-2.08


first differences

-1.32

-7.53



-2.35

-7.53

WRPLRP

level

-0.14

-0.08



-2.55

-2.01


first differences

-0.97

-0.41



-2.96

-4.63

WRGRRP

level

-0.03

-0.03



-2.32

-2.30


first differences

-1.12

-0.72



-7.42

-15.63

WRCFRP

level

-0.04

-0.02



-2.72

-1.31


first differences

-0.58

-0.72



-3.56

-12.17

WRPKRP

level

-0.05

-0.02



-4.38

-3.24


first differences


-0.77




-17.58

see Table 1 for variables' names
Bold = significantly different from zero at 5% or less
source: own calculation on ESCB price data


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