given a panel series x, for instance,
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wfcreate a 2000 2012 10
series x=100+nrnd
the following command gives rise to the error message "Invalid transformation"
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x.sheet(tform=diff) On the other hand, the command
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show d(x) and then pressing the "Wide+/-" button works fine.
It is not onvenient that the "tform"-option of the "sheet" command cannot be used in this way, and I'd like to suggest that in future updates of Eviews difference-like transformations are made possible in the application of the "sheet" command to a panel-series.
Best, mamo