The name is absent



Figure 2. The logs of seasonally adjusted money supply and exchange rate


5.60

5.55

5.50

5.45

5.40

5.35

5.30

97    98    99    00    01    02    03    04

I — Lnxreuro |


4.1. Stationarity and integration tests

First, the Elliott, Rothenberg, Stock (1996) DF-GLS unit root test, with and without a linear
trend is performed. The results are presented in Table 1.

Table 1. DF-GLS unit root tests

Variables

Specification

Lags

Test statistic

lnIPI

constant

5

- 0.904

constant and trend

5

- 2.997

lnPPI

constant

3

- 1.722

constant and trend

3

- 2.349

lnM1A

constant

5

0.366

constant and trend

5

- 0.697

InXREURO

constant

2

-0.264

constant and trend

2

- 0.931

The critical values for 0.95 (0.99) confidence levels with constant are -1.944 (-2.592), with constant and trend
are -3.074 (-3.633). The Akaike Information Criteria was used to determine the lag length.

None of the tests statistics is significant, all the variables appears to be integrated. To ensure
that all series are I(1), and not integrated of a higher order, the first differences are tested
using the DF-GLS unit root tests in table 2. Because there is no evidence of a linear trend in
the first difference representation of the variables, we conduct the second order unit root tests



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