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Unformatted text preview: j = 1 , 2 , . . . . (f) Derive the autocorrelation for all all lags j = 1 , 2 , . . . . Plot the autocorrelation function. (g) State the condition for which the model is invertible. (h) Assuming that the model is invertible, write it as an AR ( ). 1 Table 1: 3. Consider the EViews output for the time series regression of the series log( CPINSA t /CPINSA t 4 ) where CPINSA contains quarterly values of the Consumer Price Index from 1961:Q1 to 2008:Q1. (a) Brie y explain the relevance of using the series log( CPINSA t /CPINSA t 4 ) as opposed to log ( CPINSA t ). (b) Why does EViews list the sample as starting from 1961:Q3 instead of 1961:Q1? (c) Is this series stationary? How do you know? (d) Is this series invertible? How do you know? 2...
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