Christoph,
Thanks for your answer. Before posting my question I used -nharvey- thinking that it was a cointegration test command. However, this command tests for common trends among the different series in one panel (that is, the variable specified). It doesn't allow testing for a cointegrating relationship among the variables of the model. I'll follow your suggestion and try to use EViews6.
Marta.
Please access the attached hyperlink for an important electronic communications disclaimer: http://www.lse.ac.uk/collections/secretariat/legal/disclaimer.htm
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/