DeSelectByName expects a string, not an array of strings, so try oTrend.DeSelectByName("Trend_22", X_VAR, 0); instead of oTrend.DeSelectByName({"Trend_22"},X_VAR, 0); Jurgen. oxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxox oxoxoxox 3rd OxMetrics user conference August 2005 oxoxoxox Cass Business School, London oxoxoxox 17 August (afternoon) - 18 August (morning) oxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxox Dr Jurgen A Doornik Nuffield College, Oxford OX1 1NF, UK tel. UK: +44-1865-278610 fax +44-1865-278621 http://www.doornik.com http://www.oxmetrics.net oxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxox Raushan Bokusheva wrote: > Hi ox-users, > can anybody help me and say what I am doing wrong de-selecting variables > for an estimation (please see a cut from my program attached as an > ox-file ). The program does not accept my de-selection commands. > Or maybe somebody know a more intelligent solution for my problem: I > would like to do a stepwise OLS estimation, i.e., my final model should > contain only those variables which have statistically significant > parameter estimates. > Many thanks in advance, > Raushan > > Institute of Agricultural Development in Central and Eastern Europe (IAMO) > Theodor-Lieser-Str.2 > D-06120 Halle (Saale), Germany > Tel.: +49 345 2928 134 > Fax: +49 345 2928 399 > e-mail: [log in to unmask] <mailto:[log in to unmask]> > IAMO-homepage: www.iamo.de <http://www.iamo.de>