[R] dummy variable

[saraberta]

Hi,
i need a little help! i must create a dummy variable to insert as external
regressor in the variance equation of a garch model; this dummy is referred
to the negative sign of returns of an asset, so it has to be 1 when returns
are negative and 0 when they are positive, and in my model the dummy is
multiplied by another time series, the daily range. (have i explained 
well?!)
thank's a lot
sara



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